I would like to point out that black metal is actually very popular, with a solid fanbase for longevity. But, it just isn't commercially successful so people don't realize how big the genre really is. So why does a modicum of commercial success make a difference? Rallying against a band for having commercial success is really no different from people in the mainstream praising a band for how many records they sell; it's pretty superficial and it doesn't really mean anything. I wouldn't say their music is that easy to digest, certainly not any more than most black metal bands. Sorry but music is a business no matter what genre and black metal isn't really the misanthrope it's made out to be, just the socially awkward type.