I've found that I've saved a ton by buying for the Famicom and Super Famicom, even with all the added shipping costs! Why buy the NES Ducktales 2 for 200$ when I can get the Japanese version for 15$?
I started doing that too with certain games as long as story isn't an issue. I got Rockman World 5 (Game Boy Mega Man V) for around $8 with shipping. I can understand people wanting the localized versions though.