Playing tennis is cheap if you are not into competitions. But in order to compete, you definitely need money. You also need one of your parents to be a full-time supporter of you to be able to drive you to and from matches. Either that of they have to send you to FL where all of the good training camps are. Aside from the training, you need a coach, equipment, flights etc... It's just not feasible unless you have a lot of money and time. I think most black parents (at least mine) push more twds education or cheaper sports (football, baseball).
Also, the USTA is not just taking random people in. If you can support the USTA with fundraisers and donate a little something here and there to "support your country *wink wink*", you might get your kid noticed.
But I'm watching this Serena match and it's just a massacre.
Makes me want to put my kids in Tennis.