Not quite, since the progressive jackpot doesn't really cost the site anything directly (other than putting the money slowly into a progressive rather than pocketing it).  But casinos generally love them because it allows them to offer a giant jackpot without the casino ever having to take a big hit.  And without ever losing anything, they get the excitement of spreading a game where the odds favor the players.  It's just subsidized by the people who play when the game is -EV.