The problem with these games is that they are really fun to play. I haven't had so much fun playing in a while TBH (I played about 1000 of them at $30 so far)
Coming from HU hyper, having the extra position and ICM considerations added to the mix is quite interesting. Also, often you start 25bb deep and then play deeper (35bb) and then back to shorter stacks. Strategies are quite different from HU Hyper but for what I have seen, HU Hyper players should do pretty well in these as they are more used to play at these stack sizes (esp. post flop)
At the moment, a lot of the people playing them are pretty terrible (so rake is not even an issue yet), there is 0 wait between games and none of the reg wars and cartel politic BS to deal with.
it's seems that they have attracted a lot of cash players. No doubt that in a few months some of these guys will have adapted, but for the moment this is where the money is.
The format is also guaranteed to attract a regular supply of fish (because of the possible BIG win).
I was dead against them when PS announced that they were thinking about introducing them but now I don't know what to think TBH. They will definitely take players from the other traditional formats. is that bad or not? I can't make up my mind.