if you go to a stand up till with a few items and ask for a bag, would you expect your bag to be packed for you or at least asked if you would like to have it packed?
No. I get fed up of being asked if I'm alright with my packing. I'll pack my own bags, thanks: that way I know what is in each bag when I get home.
Graphista - Never expected nor wanted it as a customer either. The fundraisers I'd donate but ask them not to pack. It's usually younger kids who don't know not to put eggs under cans, bread in first to be squished or not to put bleach in with greengroceries.
I also used to pack my own bags but give them money anyway. Then I realized I was probably making them feel bad, so I now grit my teeth and let them pack, although I might try to grab all the non-food stuff myself and put it into a separate bag. It's important to encourage kids to make a social contribution: they're not going to be skilled straight away. I wouldn't have this consideration for adult fundraisers, unless they clearly have learning disabilities.
AlmostAJillSandwich - If this was in Aldi, they expect you to put your shopping back in the basket/trolley then go over to the table along the wall to pack it in to bags.
That's how I remember all supermarkets doing it in the nineteen-seventies (and I think into the eighties). People with cars would use the bench to pack their shopping into the cardboard boxes that fruit, cans, etc., had been delivered in, which therefore got a second use rather than being crushed and disposed of. It was only people who had to carry stuff home on foot or by bus who used carrier bags.