Easy.
If you are a great young female athlete in the US, soccer is your best choice for being a top athlete and becoming famous albeit not rich.
If you are a young male athlete in the US you have multiple choices about which sport you might pursue and in truth, if you are really athletic, soccer might not be your first choice.
To put it another way, in most towns the best female athletes play soccer (at least as a team sport), the best male athletes split between soccer, football, baseball, basketball, hockey and lacrosse.
To put it yet another way, if Barry Sanders, Dionne Sanders, Jerry Rice, Bo Jackson and all their pals played soccer from childhood to adulthood we'd be a perennial world cup favorite.