Just sold a comprehensively water damaged (dropped in a swimming pool) but very modern phone (Nexus 4) on ebay for £50.
Various people bid for it, the one who bid most paid straight away. Assuming they receive it in the post, then it should be okay.
Listing mentioned about 20 times that it was broken, to save time-wasters. I suspect it is worth £50 to the buyer to split it for the parts that aren’t damaged (fancy glass back, brand new spare battery), and a gamble on the parts that appear to be working (screen).
Had one buy it now question, but no other hassle. If you get stupid can you post it abroad questions, you can just ignore them.
I don’t know about anyone else, but as a buyer I hate best offer – it always seems like people who enable it pretty much want 99% of the buy it now price, so why the heck put it on there. Just start it at 99p, and put it on to end on a Sunday afternoon/evening. There are enough people on ebay that you’re not going to get missed and sell it for a fiver, and more people bid on things that start at 99p, so you’re likely to get more money. Or so it seems to me.
As a buyer I also wouldn’t usually bid on a buy it now for second hand stuff – people pretty much always put stupid high values if they think it is worth a buy it now, whereas auctions you can sometimes get it for not a ludicrous amount of money, and there is at least some honesty about how much it is worth.