Brandon Jennings and Emmanuel Mudiay are the only ones that come to mind. Thon Maker was an interesting case, but I guess he doesn't qualify for this discussion. However, Jennings and Mudiay are also really the only highly-regarded prospects that have gone this route, and it worked out pretty well for them. Terrance Ferguson is going that route now, and projects as a lottery pick in the upcoming draft. Again, no one is forcing these kids to go to college. They are more than welcome to go other routes, which are proven to also be successful.
It is much easier to sit on a computer and tell a 17 year old to go live in a foreign country where they don't speak the language than it is to actually be a 17 year old living in a foreign country where you don't speak the native language.
Why do you think they shouldn't be able to make money off their own likeness?
I'm not asking what they currently receive from the school; which is basically "We'll let you enroll in our school for free and not charge you to live in buildings on our campus we own and will feed you at the facility so we can help make sure you're eating right so you can help us win more games and have higher ticket sales, exposure and alumni donations. And we'll give you all the free gear you want from Nike because we know you are a walking billboard and know the thousands of people who cheer you on will want to buy the apparel you're wearing at our university's bookstore." Those are two separate things.
Just a simple, if you don't think they should be able to make money off their own likeness - why not?