"Now I'm considering moving into pure R&D work (which previously only larger corporations could afford) and even sponsorships for promising young athletes in the third world."
And this benefits the USA how?
Well, a couple of my offshore people are here in town blowing a big chunk of their income at Disney this week. (I think the rest has gone to US rental car companies and restaurants).
I think it was a US-based airline that brought them here.
The laptop computers they bought here are Dells - isn't that still a US company?
And, as far as R&D...well, it's pretty obvious that R&D benefits everybody (how fast is your CPU?) - regardless of whether it takes place.
However, that said, I must also stipulate that I subscribe to the philosophy of Any Rand, which suggests that one benefits society by benefiting oneself ("the virtue of greed"). And I do believe that I am personally benefiting from the arrangement.