In reply to JJL:
> They're around £600 new.
> I would be using them myself.
> I'm going to tell them to ebay them.
> I can't rip little old ladies off
>
Because no one ever gets ripped off selling on eBay.
This is ridiculous, it's not about the value of the item, it's about the cash to them at that moment - not three or four days later once you've announced your good intentions to UKC. If they were buying stock and losing money from not understanding it then that's one thing. If you give them £50 for them and tell you friends you bought them at a bargain in their shop they'll visit too. Net result more cash.
Instead they'll start doubting themselves at every object. They'll worry about underselling and less will be sold. The older generation who volunteer in these shops and who are less likely to be au fait with eBay and the like will become disenfranchised, not understanding what they should be doing.
You may have started a chain reaction that crashes the charity shop system - the last thing holding together 80% of the high streets. Without them it's just betting shops and mobile phones outlets.