Good for them. I think that they really don't give a shit what people outside of their fanbase think. And it's funny, because this website almost revolves around a band who treats their fanbase like garbage (for the most part), yet most continue to say it's silly that MGMT make music for themselves. Just saying. Not intended to bash anyone, as we all have our own opinions but still... Keep an open mind.
It's an interesting point to make with this particular band, though, because most of their fanbase was based on that first record, and specifically the singles like Kids and Time to Pretend.
With each release they're getting further and further away from that sound that most people liked so it seems to me that at this point they're just making music for themselves and don't give a shit what their fans or anyone thinks, and if a small fraction of that initial fanbase like the crazy out there unconventional stuff then that's gravy.
Fortunately for them (if they even care), festivals will be happy to have them based on those first singles for years to come it seems.