I sold two bikes last week
Both of them had been available for over a year and very little interest
One was a 60cm aluminium Orbea from 2004, with various additions (new brakes, better wheels, better saddle etc) Nice bike but it's size and being an Al racer seemed to make it hard to sell
The other was an aluminium Ridley, which I suppose you'd describe as a winter trainer. It had hand made wheels, a rack and generator powered lights. It was a few years old not as old as the Orbea. The size was less than the Orbea, more in the average guy kind of area. Dunno why this didn't sell before. Maybe people don't want racks on a road bike? Or the price was wrong?
Anyway sold them both for 300 quid each on the bay (so the net amount is much lower but hey, whadda can you do?)
My tip is, if you have a spare bike you've been "meaning" to sell, do it now. The weather is great and everyone wants a bike