Look where Fischers zero tolerance has gotten them in the market. They were bought out and were hardly a factor in the industry. Wilson and it terrible quality control is by a country mile the leader in tennis racquets sales in the United states. I see all types of players using Wilson: Pro's, Weekend hackers, 5.0' etc etc. My point isn't that Yonex or Fischer don't make good product or even superior in some cases. My point is that they are filling a need that doesn't exist. In Fischers case they were bought out and from what I hear would have stopped making racquets had this not occurred.
I do not work for Wilson and do not play with one. Bad quality control to me would be flawed cosmetics, cracks, chips, frayed grips etc. That would be terrible quality control and Wilson would suffer as a result in the market place. They haven't. all the marketing in the world won't get good players to use your products. And plenty of good players use Wilson. the reason Wilson has money to market is because they sell product because people want it.