I've just put the first dozen items from my model railway up on ebay (username "I-am-skint", 'cos I am). 14 down, 50-ish to go.
When I was a teenager, I built up quite a collection, always intending to have a decent layout sometime. However, a lack of money and space always prevented me from achieving this. And now, since I'm really running out of readies, I'm selling it. Nearly a thousand quids-worth when I bought it. Worth about a third as much now. I tried to offload it to the shop where I worked Saturdays in Skipton (where I bought most of it from as well - they've had a change of management since), but they don't have the space to display it. And I was told there's probably nowhere in the area that'll take second-hand - nearest place is Sheffield, apparently. So, ebay it is.