A couple hundred maybe. When I lived in Japan, I had access to a bunch of stuff that is/was pretty hard to come by here. Even 4 years ago, it was much harder to get some of the Japanese material. I never really had much intention of profiting though. As a collector, I was paying collector prices which left very little profit margin if I actually wanted to sell them. I helped a few collectors with some pieces they might not have found otherwise.
That said, packing, shipping, etc is a major pain in the ass. It is worth it to be able to help someone out, but absolutely not worth it (to me anyway) for small scale profit.