A few years ago I volunteered in a charity shop ( with my children so they could have work experience)
I can see why the managers think that pricing high brings in most money but the opposite happens.
Selling high street stuff dirt cheap and "accidentally on purpose" underpricing Johnny walker jugs is what brings in the cash because people come back to search for more bargains.
Revamping as high class boutiques works well in a few places,
(I recommend Alderly Edge. Not cheap but the very smartest brands)
but in the more normal areas people only go in them to snigger at the high prices.
Customers complain that the staff have first pick on the stuff.
well.... Considering some of them have to sort through donations of used condoms, tampons, dog dirt and colostomy bags (traumatised for life. Where's my compo?

) so what!
But I have never seen or heard of anyone stealing the donations or underpricing for themselves.
The system is usually that someone else has to price if you want to buy, and in practice most pay more out of guilt.