Well, I guess I will take the first shot at it. Personally, I feel that if cultures didn't share their art with one another, we would still be drawing on cave walls with sticks and berries.
There are still tribes in the rain forest hand poking tattoos with bamboo, because that is all they know. But, instead of just selling him some set up and cutting him loose, examine him as a person and as an artist to decide if his heart is true to the art, and deserving of what we have all worked so hard for. (some more than others. lol) And if so, give him guidance, not just tools. Remember, tattooing didn't start in the US, it started in other countries and by other cultures, because of their sharing we, as tattooers, can do what we love and respect.
I hope I didn't piss too many people off, lol.