It's actually a solid little game but as your August post pointed out dumbasses have skewed things on what is rare versus faux rare to rake in the added coin. Cotton was a US release and easy enough to find in decent numbers in the day at retail and online too and the Japanese one was fairly common as well. Now they get stupid pricing. Rockman is notably more rare and it will go a little less which is crazy. There are some games that got lower runs but nothing like the post-US english stuff or oddball Japanese such as Crush Roller and Magical Drop yet look at what people pay on those.
Factors like that made my last buy be many many months ago be a game only price on a complete box set for Biomotor Unitron, and I'm still eyeing for the overly common yet oddly not showing on ebay a lot lately baseball stars. Outside of that I got RetroHQ's NGPC SD Kit instead of ponying up for Cotton and Rockman I once owned.