This is the For Sale Forum and I certailnly don't wish to clog up your attempted sale, but I would truly suggest picking up Derek's book, "The Ultimate Hang" before you throw in the towel, since you've already made a substantial investment.
Derek himself has mentioned that he tossed and turns regularly in a bed, but a hammock helps overcome that. (That may not be in the book), but I know he's mentioned it. Anyway, I'd really suggest perusing some of the other threads and giving it another shot. Should you wish to sell, it will no doubt. Whomever does acquire it may keep hearing the words "Out, darn spot" in their heads but that's there own conscience.