I am not a lawyer so my obviously it depends on what you are like. If you are someone who can get shit done, have enough money to last a year on your own, and don't have a wife or kids there's not much stopping you.

I just didn't think it was worth waiting for a greencard. I was on an H1B for a year, and realized I'd have to wait 5 more years for a greencard.

Now I look back and just think it was a mental road block (a big one albeit it).