What you are selling presents a high risk proposition for the purchaser so it is not surprising you have had a few people casting dispersions. How you have responded to that though speaks volumes, you may not need the business as you claim in which case good luck to you but telling people to go fuck themselves doesn't show you as a vendor I or many others would ever use. I have no vested interest here, I haven't trolled you or bought from you, maybe in your eyes that puts me in the go fuck myself category but as any credible vendor will tell you reputation is everything and you are only damaging yours with every abusive response.