I thought it was just me! I was spluttering over my toast reading them this morning!
If I do DP & me a "posh dinner" I don't spend nearly that much on ingredients. The only thing I can think of is that they're counting the cost of (for example) a whole bottle of oil, a whole packet of pasta, as students will be buying from scratch?
BTW, I tried the Crispy Fish Pie from the Student Cookbook that came with Saturday's paper last night - it was fab! I used courgette instead of mushrooms.