I think you have a point there jingl!
Last year I had a very dear friend I only see every few months (she still works in London) coming round for coffee and I thought I would push the boat out (!) with some posh biscuits The co-op's poshest were something like £2.75 for about 6 Duchy Originals so I thought s€d that, I'll bake some lemon and polenta shortbread.
Couldn't remember if I had plain flour, so bought a 1lb bag (£1) not sure if I had any lemons, so bought 3 for 80p, then worried I might not have enough butter, so 1/2 lb, 95p. I knew I had sugar, by the way.
If you have done the maths already you will see my point! But I did use my own polenta and the quantity made about 32, most of which disappeared all too rapidly.