This actually sounds amazing! I don't think I've seen this anywhere before, but so far it seems great. <3

Although I have to ask, will you maybe consider having some kind of an in-between for the current difference between the free and paid account icon numbers? Paying for a 100 while only needing 30 is a little much, especially considering it's a secondary one. I understand why you don't want to sell icons to non-paid account, but maybe there's some other approach that could be used?