it's wrestler heavy because there are SO many wrestlers. not because there's no opportunities for elite wrestlers. you think the comparable judo player to an all-american wrestler has good long term earning potential from judo? or sambo?Outside the US state funding of wrestling is often better but within the US wrestling just isnt a sport you can build a career on very often even if your one of the very best.
Thats really why MMA has always tended to be wrestler heavy, you have the talent base who can't earn much in their existing sport, the same way amature wrestlers often ended up in pro wrestling in the past.