Limiting things creates demand. Then the next time some "rare" Uhmeebos come out or whatever they shovel on to us in "limited" quantities, people are chomping at the bit for it. Oldest marketing trick in the book. As long as they can keep on rolling out "limited" items, then the cash flow will continue to be FAR from limited.
Yes, there are some people who bought a Marth because he was rare, at the same time I know a ton of people who wanted the Skull Kid figure, or Little Mac and Villager Amiibos regardless of them being rare or limited. They got the hype going, but nothing to fill it other than scalpers. They would make FAR more money making more because they would sell more. Hype for Amiibos is not helping DK, Peach and Yoshi, who many stores are now putting on clearance. People want many of the characters because they want the character, hype may contribute but it only does so much when there are no more to sell.
Yes. They will make more, albeit new, different characters. And you'll buy them. Nintendo knows what they're doing here. They aren't short-sighted or unaware of the popularity of these things.
Like I said, create demand by limiting supply, then continue to churn out new product within that line.
Simply "making more" does NOT guarantee more sales. On the other hand, constantly having new items for a product line which has proven to be very successful is a fairly surefire way to do so, and they seem to be churning out new characters with ease.
I'm not sure why some of you can't see how simple a marketing tactic this is and why it's so successful. If ALL of these silly things were available at every store, all of the time, then nobody would be having these discussions and how acquiring them is akin to stumbling upon the ark of the covenant.
Even the resellers help Nintendo's cause as they only further the idea that some of these are so rare and unobtainable, thus building all that much more hype/excitement/etc.