Forgot to add; I've personally known four, three I knew in high school and one several years later who left the witnesses and became quite involved in the 'church of satan' even presiding at black masses and such... (no he didn't have any 'powers', unless you consider the ability to drink massive amounts of hard liquor while smoking pot for HOURS without passing out to be a 'power')
I did decide not to associate with them to much! It wasn't motivated by fear however it was mainly motivated by a desire not to be associating with moronic goth ass clowns! (I did associate with the last ones sister though! MEEEEOOWWW!)
I've found that most satanist (in my experience) are outsiders who want to fit in but not conform to the big group! So they make a small group and conform to it!
Usually kinda confused!