First, give a frag away to a close/good friend to have as a backup if you lose yours. Then, sell them for whatever you want. Don't worry about being cheaper than other people. There is a local who has a massive amount of WD and he sells it for $40 a large frag right now, but our market is saturated with few people who want it who do not have it - in other parts of the country, people would buy him out in a few minutes.
I will often sell nice coral for really cheap, but also give stuff away. Over time, I do get a lot of nice coral from people who return the favor when they get something nice. Not everybody gives back, but I remember these people.
Lastly, you cannot overcome the karma of being greedy as a hobbyist. This seems to always come back and get people.