Lol yes... everyone loves JDM parts. I mean, youre driving a Japanese car; its cool to have all the trim and such that wasnt available here.
There can be money in it, but it depends on whats being purchased and how youre shipping. Shipping can get real spendy from overseas.
I buy a lot of items overseas and it really pays to have someone local who likes finding what youre looking for. If youre cousin is over there, but couldnt care less about cars, hes not going to put in the effort to find you those nice exclusive parts youre looking for. Even more so on a 40+ year old car, the parts arent going to be just falling from the trees. If they arent having having fun looking for the parts, they may skip over a bunch of opportunities where parts could be hidden. That or to make up for it, theyre just going to charge more for their time. Also someone into specifics... I have a friend stationed in Japan right now who likes cars, but knows nothing about Datsuns. Just short of telling him to buy everything in an old Nissan box, its hard for him to know whats good and whats not.