The mods here are very strict. I posted an HD600 and asked for PayPal fees or gift, and they edited the part about about fees out, and sent me a polite note saying why, and that I might want to update the posting. Lots of folks break the rules, and the mods don't monitor every post. If a person uses the "report" link, the mod will get involved.I bet there are mods here who don't know that rule... I think if you listed it for what you want, it's fine. I think that rule is to prevent someone from building a business on HF's sales corner, not selling a one off amp that was for your own private use.
I sold a crack here that netting me $400, about what I paid. It was not purchased on sale, and had a few upgrades that I added. The buyer was not the type of person to build there own, so he was very happy. I agree that the intent of the rule is stop folks from using HF as a business outlet, and not paying for the MOT badge.