One huge problem I have with people being open about being Satanists is that if too many people do it, it might become popular! And that would be a shame. Imagine legions of brain dead college students claiming they were Satanists and ruining the idea in the minds of worthy people. Though, to be fair, if these people are discerning enough they will read about it and see it for what it really is. So maybe its not a huge problem, but I always appreciated the underground nature of Satanism (despite the appeal of seeing Satanic churches dot the skies of cities).