We had this discussion about colour blocking last week....
The problem by size is that sizes are not consistent. If we put all size 14 clothes together, we'd get people moaning that a size 14 from M&S is huge, but they can't get even one leg into a size 14 from H&M. Lots of people cut labels off their clothes so we have to guess the size anyway.
Also, most big charity shop chains are pretty clued up when it comes to maximising revenues, managers get sales figures broken down in every way imaginable. If colour blocking wasn't profitable - or if arranging by size was more profitable - that's what they'd be doing.
We have to ask about gift aid - it's another 25% on top of sales price which makes a massive difference. None of the volunteers I work with gives anyone attitude about it though, it's a simple "are you a taxpayer" question and if they say no, that's fine. Nothing to get in a huff about.
The main problem is that most charity shops have one paid member of staff. Ours does 36 hours a week, the shop is open 52 hours a week. She has to do everything from recruiting new volunteers, health and safety training, attending area meetings, window displays, paperwork, banking, all the compliance stuff, ordering new product, liaising with other stores to send our excess stuff to them. And that's before she gets to the daily stuff of making sure the store looks OK and filling shelves. She just doesn't have time to do loads of training with all new volunteers, some of whom do a couple of shifts and the fall off the radar again.
Obviously there's no point in pricing too high and things not selling. But on the other hand it's the job of the charity to maximise revenue. We know our customers are happy to pay £2.49 for a paperback. It was £1.99, the prices went up at the start of the year, the figures show there has been no impact on sales. Same with clothes, our customers will pay more for Boden/Hobbs/Cos than they will for M&s or Zara. But again the manager isn't omnipresent and simply cannot be there to oversee every pricing decision - she just draws up the pricing guidelines and has to trust volunteers to stick to them. But mistakes happen.