I have sold five bikes in the last 12 months. I got really good deals on most of the bikes I own so , fortunately , I haven’t lost any money. What I gained was years of riding and enjoying the bikes while I owned them . I let them go cheap and 3 of them were very high end , original , good condition ( actually excellent ) bikes. It is getting harder to sell vintage road bikes , the last two were almost give away cheap. I think I am to the point of just selling the Campagnolo stuff and giving the frames away!