I think that there are two sides of the same story. I'm a gear head and I'll explain why in this post.
There's people who spend money on tennis and people who don't. The amount of money they spend on their gear is not proportional to the skill they have, but it doesn't condition them to stay at NTRP 3.0. In fact, if anything, spending money on gear will most likely boost your confidence and in tennis, being the psychological sport that it is, that can translate into better results.
Will having the latest racquet automatically make you the best player in your club? No, but it will certainly help if it boosts your confidence. Playing with a racquet that you know you can trust is a huge deal in this game. Anyone who's ever played a match knows that the psychological part of tennis can determine the outcome of a match, especially if it is a competitive one.
I started playing in October 2007 (6 months ago) and I had never done anything related to racquets before. The learning curve was steep. Until today, I've probably had 30 private lessons and my level has increased noticeably from a 2.5 to a 3.5 in just 6 months.
My very first racquet was an Aero Pro Drive+ and I didn't like it. I switched to a lighter one, the Aero Strike and I liked it for a month but then discovered that it would twist in my hand when volleying, so I started looking around for another racquet. While everyone who "knew" racquets insisted that I should continue using the Aero Stike because it is a nice social racquet, I just knew that there had to be something that felt better. So I bought and RDS001 MP without even trying it. I liked the specs, what can I say... Almost immediately, by 2hbh improved and this heavier racquet made my overall game better. After some weeks I started noticing how stiff the RDS001MP felt and wanted that same racquet, but flexier. The obvious choice was a used RDX500MP. I hit with it and immediately liked it. I bought four of them (although I intend to keep two and sell the other two). Lately, Babolat's distributor down here asked me to try the new Aero Storm Tour. Guess what? It plays even better than the RDX or RDS. The extra weight absolutely helped my game and now I can hit 20+ shot rallies with heavy spin and serious power, something that I was never able to do before. Whenever I grab the RDS or RDX, I cannot do this, at least not with the pace the Aero Storm Tour gives me.
So, today I have 4 RDX500MPs, 3 RDS001MPs, 1 Aero Storm Tour, 1 RQ7, even though I only use 1 RDX, 1 RDS and the Aero Storm. I intend to keep 2 RDXs, 1 RDS, and the Aero Storm. To carry them, I use a 9 pack Yonex Pro bag I bought used on the boards. I used to hae a 6 pack Aero Bag which I sold when I got rid of the APDC+ and the Aero Strikes.
I own one pair of Yonex SHT306CL shoes, one pair of Babolat Team Clay IIs and one pair of regular Nike tennis shoes. I have 4 Yonex shirts, 2 Yonex shorts, 1 Yonex cap, 12 Yonex vibe dampeners (I absolutely love them), 1 Nike dri fit polo shirt, 2 Nike shorts, 1 Adidas shirt, 1 Adidas short, Reebok windbreakers and the rest of the winter clothes (playing outdoors on clay with 10-12 degrees celcius is serious). I have several wristbands, etc.
I've also tried the following strings: PHT, PHT17, Ballistic, Attraction, Xcel Premium, Ultra Tour 17, Ichiban, Tour Super 850, Sensation, Big Banger Original, Big Banger ALU, Big Banger ACE, and probably one or two more. I kept the PHT17 / Xcel hybrid.
I have 4 ASO ankle braces which I bought after rolling my left ankle twice. I only use 2 and kept the other 2 for when the ones I currently use wear out. The pain was so great that I don't want to risk my ankles again.
I'm barely a 3.5 player and have no intention of going pro, but tennis is my hobby. I like it very much and it is what I do when I'm not working. It is normal to throw money at it just like motor heads throw money on their rides even though they are not professional drivers. When you buy a computer, you want the best your money can buy, even though you know you probably don't need a quad core. If we translated the main point of this thread to computing, 80% of computer users should run Pentium IIIs with Windows 98; after all if you only do email and browsing you don't need anything else. When I was learning drums, I had the crappiest kit available. It was completely discouraging because the cheap wood make the drums sound like crap. It wasn't until I upgraded to a Pearl drum set with better sounding wood and cymbals that I got seriously involved in drumming. Same thing when I learned to fly, it wasn't until I used something better than a lousy Cessna 150 that I really started loving it.
As I said, I'm a gear head but I admit that when people think I buy things because of certain players it embarrasses me. For example, I like Yonex. The whole brand just seems to click with me. Down here Nalbandian is huge and everyone thinks I use Yonex stuff because of him. Hell, the last time I saw him play was last year during Madrid! I'm not even Argentinean! lol So because he uses Yonex, everyone here assumes that I'm a Nalbandian wannabe. Truth be told, I don't really have time to even watch tennis. Why would I want to be like him? It's like saying that your neighbor chose Chevrolet because some Nascar driver uses it...
I completely disagree with the whole "learn to play with a Walmart racquet and use a rubber band" theory. People should learn with something that they like, regardless if they're up to the "level" of it. If they chose incorrectly, sooner or later they'll know it and move on to something else. It is their money and they should spend it as they wish.
The best you can do is own one of these gear heads if they have a big mouth, otherwise I think the big mouth is yours.