The "4-year renewable" visa would make me hesitate, unless you don't mind going back to where you came from in case your business didn't work out or you got lai

The "4-year renewable" visa would make me hesitate, unless you don't mind going back to where you came from in case your business didn't work out or you got laid off. The feeling that you're in a temporary situation can't be very nice, and will prevent you from fully committing and settling down properly. Why not offer a Green Card or some other kind of Permanent Residency?