You're right about condition. If they don't look absolutely perfect and unopened, then it's a hard sell. Even the slipcases have to be presentable.

I came by 3 boxes of them (around 60 volumes) about 6 months or so ago. I put all the perfect ones on ebay. No research, just started them off at £6.75 with a BIN of £12. Just over half of them sold for good prices. I've still got the rest. I'll try them again sometime. If I had a shop, I think they'd be a good shop item.

Having heard horror stories about FS collectors, I was very worried about the feedback, but all was fine.