It really isn't as expensive to get started and find good classes/programs to develop solid juniors. It does get more expensive when it starts becoming something of value for the player, as in possible college funds, sponsorship, prize money, etc.. But even there, there are great values out there for developing those players. Too many parents don't have the time and do have the money, so they just buy what is most commonly known and marketed, which is the big names and big places. But my son's main coach is a head coach for a D1 college, past ATP player, and a veteran, credentialed coach, and his juniors program is ridiculously reasonable, while turning out some of the states top juniors and plenty of college recruits, as well as some that compete at the pro level. You can do their after school clinics for 12 session for $189, and that is a solid, structured 2 hours of play/practice.
And there are plenty of programs like this through out Arizona. I doubt that isn't replicated in other states.