Capcom apparently didn't want to publish Rockman 6 in North America, so Nintendo did. Europe never got the final game it seems. Interestingly, 1 and 6 are the more valuable and less common of the 6 in Japan as well as North America. I think the only trend that doesn't match between the two regions is the 5th game. I think it's cheap/common along with 2, 3, and 4 but in NA it seems to be less common. FC in general had more love and attention towards the end of its life despite SFC's era starting, whereas NES was dying/ignored far more quickly and everyone was jumping ship to SNES. I assume that Europe saw the same attitude for their PAL NES/SNES situation. As an example look at the set of late Konami games they never had intent to release outside Japan.

So the lifetime of Famicom was about 11 years? 1983-1994? Don't you wish NES experienced attention all the way to 1994 equally as much?