Facebook charges for advertising these days. In the old days they would automatically connect business/artistic pages with all of your friends, and friends of friends. Now they seem to block out anyone but a few people, and then constantly send you ad pop-ups, charging you $20 for every 100 people they display your page to. The prices vary, sometimes high and then lower. Maybe someone else getting diff prices, as my friends all have alt experiences with this...
I have over 400 friends, and fewer than 25 it seems have seen my artists page in the last year.
So a huge market, but 'ol Z Berg changing the rules to make fb more money.