Yeah I tried to sell mine when it was at 0.245 per GH (bought for 0.2) - someone bought 0.06 GH worth lol
The nice thing is you can leave it for sale at a set price and it will still mine for you in the pool. I guess you have to wait until someone comes and buys GHS at or above your sale price. It would be a nice option if you could set it up where you sell your own GHS as an option price. Then there would be a list of options you could choose from outside of the base market price.