The reason is not in the Pokemon. This is a game that allows you to make money at the same time. Such projects in the field of cryptocurrency are just starting to appear. Pay attention also to cryptokitties - the idea is absurd, but how viral!
yeah, it's just must should be on the wave of hype. more people talking about project - more popularity
By the way, here's a comparison with the Pokemon gives a good benefits, too.
Well, at least the fact that those who like one game, like the second, because the idea is the same. Also, this comparison attracts attention even if you just meet him on the forum, as it was with me.