This is so interesting because we have attended 2 school things like this in the last few weeks.
School number 1 was all cakes/cookies/scones brought in donated by parents, no fancy ones really just all what you’d expect to see home made. They were I think 50p a cake, 50p a cookie, 80p scone, tea & coffee were free, squash was 20p or they were selling a small plastic glass of fizzy pop for £1 poured out of a big 2L bottle.
School number 2 was some cakes/cookies/scones & sandwiches, some were from parents but mostly they were donated from local businesses like cafes/bakery etc so they looked really lovely, like what you would get in a coffee shop. Cakes were £2, cookies were £1, scones £1.50, the sandwiches I think were also £1.50 but were like Costa style sandwiches (posh ones, rather than your basic tuna mayo if you know what I mean, but cut in half), tea & coffee were both £2, squash was either £1 or £1.50.
There was nothing left on school 1’s table by the time we left, a handful of broken biscuits maybe. School 2 still looked pretty much untouched. Both schools have since put out a post about how much they managed to raise, school 1 beat school 2 by a mile.
I do think for these kind of things you’re better off pricing low and selling more.