My 5 cents...
I will never purchase an expensive frag or coral from anyone other then a store. There is no one person who personally imports a coral. Stores work hard, have crazy over head and need to reflect that in the price of their products. If I go to a store and purchase a coral and end up selling the a frag, I do not look to make store prices. I am not relying on the sale for my living wages, I do not have 5 employees, store front location, equipment, CITES, 2AM pick ups at the airport, and the list goes on. I grow coral in my tank because I enjoy it. I sell corals to help pay for the upkeep of my tank. Help pay...not pay for. This is a hobby for me, of which I like to share my experience. Some can attest, I sell things for a lot less then a store would charge, sometimes I sell too cheap. To put it in perspective a little, a store has 5 employees looking to make $30,000 a year, that is $150,000 in wages a year, which is just over $400/day they need to PROFIT. Not just make...profit. Then there is the store location, equipment and the list goes on. I am perfectly happy paying higher prices at a store if there is something there I want. But if I go to someones house and they want the same $80 for a frag as what the store sell it for, I will walk away. Typically I will never pay a person more then 20-30% of what a piece retails for.
People are free to sell here what they want at the price they want, it is up to them. It is in our best interest as adults to not burn a sale. If something does not sell for a while, maybe make a suggestion to lower the price, but there is no reason for anyone to hop on a for sale thread and tell people where to get it cheaper. Sellers should research their item and sell appropriately, but buyers need to take some of that responsibility as well. Yes, someone may get 'burned', but we are adults here who should be able to take responsibilities for our actions.