I think most people who have an A2k, A3k or A4k would only part with it when you pried it from their cold, dead hands.
I got my A1200 second-hand off a friend for quite cheap. Considering the expandability potential of an A1200, compared to most Amigas, they're worth it.
50 euros is a good price for a stock A1200 IMO.
I'd like to know why DoomMaster thinks an A1200 is a toy, and what makes an A2/3/4k so different... I'm fairly sure the upgrade costs are about the same, and you can make a fully expanded A1200 just as good a performer as a [fully expanded] A4000...