This is a great idea, can I do this too?? The government can give me 100 visas to allocate, and I'll give them to international entrepreneurs whom I consider to be deserving and who incidentally and in a totally non quid-pro-quo fashion agree to sell me a 7% stake in their companies for a nominal fee. I'll also buy them pizza once a week, if that sweetens the pot.
If we assume only YC & some of the other incubators it starts to drive more traffic to them and raises the barrier to entry for a new incubator as they probably won't be on this program (allocating visas).