Saw some Waixing or Nanjing crap games sell for huge prices on ebay the other day, but most of those titles can easily be bought for $20 or so. I personally feel that it is easy to judge pricing, but on the other hand, some of the prices that people are offering to pay here for stuff is quite now, and some collectors (such as I) would rather have the item than the money, at that point. Anyway, not going to comment on it anymore.
Also, I would recommend that you guys check out Shazam's ebay auctions:
http://www.ebay.com/itm/Funblaster-Pak-by-HES-for-the-NES-Boxed-Full-of-Sachen-Games-/290936947316Here is one item (boxed HES game), but he has several Game Boy titles up for grabs, some Sachen stuff for the NES and Famicom, etc. There are definitely some interesting things, the prices are not crazy (at the moment), but if living abroad, the shipping seems a bit crazy. Anyway, a lot of good stuff that someone here might be interested in.