I think because it's not all that easy. Brandon Jennings has said before that it was a shitty experience and that he would advise against it. You aren't some big star coming into the premiere league in the world, flying first class everywhere and staying at least relatively close to home. Going to Europe, a kid is immediately on his own and asked to be an adult. And there's also the culture barrier with language and certain customs.http://espn.go.com/mens-college-bas...2/emmanuel-mudiay-signs-12-million-deal-china
Honestly, Im surprised more guys that already have planned they will still only 1 year before entering the draft dont do this or even the go play in the NBDL for a year, although Mudiay going to make a million and i think the minimum salary for NBDL is only 17500.
If the NBA does somehow change it to a two year old or some other sort of increase then I definitely think more kids will try it, but I doubt it will ever be a significant number.
Also, make no mistake, part of what motivated Mudiay's decision was almost certainly eligibility issues. That Prime Prep school he went to has had a ton academic and eligibility problems.