Let's do a 1 cent to 1 Bullshit Buck scenario.
You want to buy that sweet thing that costs 1600 Bullshit Bucks? Too bad, you can only buy 2000 Bullshit Bucks at a time. Now you have 400 Bullshit Bucks that you can't do anything with, because nothing in the game store is that cheap. So you either have to buy MORE currency and hope that you can purchase something that will even things out, or you basically just handed the company $4.
The spending comes strictly from my entertainment budget, for obvious reasons.
The "leftovers" from my purchases truly don't bother me since I'll use them later anyway as I buy more.
The games are clear in what they sell (particularly Fire Emblem Heroes after they got burned once by the players). I am acutely aware what I am buying, and what I can get with them. I am happy with the experience the games provide me as a whole, else I wouldn't be playing them for the better part of a decade straight and paying them my money.
So no, the games I cited aren't scammers. You are welcome to not like the business model, but calling them scammers is unwarranted.