Rare, com'on, we're not talking about a Picasso here. The creator is not dead. We're talking about living growing corals. Unless you have some special inside knowledge of the place they were collected from, you have no idea if they are rare or not. Most likely its a marketing scheme. And those that have a nice colony certainly don't want to let the cat out of the bag, because they want to sell some $80 frags themselves. Keep in mind, anything that can be grown and sold for big profits, will eventually become common. If you have a $1000 Acan, guess what, its now worth $200.
Now there are some legitamate collectors. They know what they want, they know what they are getting, and they know what they will have to pay. Its still about as stupid as paying a huge price for a limited edition beenie baby, but hey, we all get to have our little quirks. At least these people are educated. A quick scan of alot of the coral sites will show you that they want to market to the average hobbiest. They sell common corals for uncommon prices. Since some are sponsors of this site and like everyone have the right to make a living, I won't out them. Buyer beware, not my responsibility. But they are selling common corals for $80-100 for 1 to 1 1/2 frags and hyping them like they're something special.
Mike