Prices are pretty reasonable, you will find some great deals. Most of my frags will be anywhere from $10-$75, most well under $40. I have some pics and a list of corals earlier on in this thread.
For the most part sellers set prices and nothing goes to the club. The club set this up fr the members, I am donating a couple of frag packs to the club raffle ($120 value). The club makes money through sponsorship, paid raffles, paid memberships, google advertising and the annual expo held in April/May.