Because it's your property and you want to sell it... If you don't want to post it for this reason then don't - simple.
If you can find a buyer happy to waive their rights - that's fine too, PROVIDED you both have this clear understanding before any money is accepted.
PCP's are a different kettle of fish and to my knowledge, there are only 3 legal ways of transfering these : F2F, RFD and a commercial account courier.