Guaranteed Poker Tournaments - Business plan?

[Toonces]

It seems that these guaranteed tournaments are becoming more and more popular. Many of these tournaments tend to attract just below the breakeven point. But what I don't get is how the casinos are making money on these guaranteed tournaments, particularly the ones that fall below the minimum necessary to break even. Is it just to get people used to playing on your site? Are they making money on these tournaments in a way I am not thinking of?