I'm really not at all keen on forking out for more than the original asking price of a cd/lp/set as I don't really think the collector's market is a healthy one musically (clearly it is healthy financially). I also only buy things to listen to and see no point personally in owning an item of music that then remains untouched and unplayed.
I have paid a little more on occasion, the one sticking in my mind is £20 for a mint vinyl, EX sleeve first pressing of Neil Young's Journey Through The Past double LP soundtrack, but that's really as far as I'll go.
This might cause problems with A. Braxton, my latest obsession, so you might see me confessing to the ridiculous later on...