I'd like to learn Japanese and I've lately gotten interested in playing imported games. So far, I've only imported DS games since they're region free, but I'm considering modifying my SNES and importing some of my favorites. I've noticed on eBay that imported SNES games are ridiculously cheap. For example, I bought my NTSC copy of EarthBound off of eBay for $60, cartridge only. I can buy a Japanese Mother 2 for $20 or less, and it comes complete with box, manual, ads and inserts in like new condition!
From what I've read online, modding an SNES is a simple procedure, so why are imported SNES games selling for so cheap? Is there no demand for them or something? I'd think the fact that it costs more to buy from an overseas store than a local one and the fact these games are considered old (which I guess means I'm considered old since the SNES came out during my generation

) would make these more expensive.
I'm just curious (and trying to add to the forums in some way since all I seem to do here is read and/or request).