I'd rather share with people than live alone, unless the people are completely impossible to live with. I've only really experienced the latter in this place - I thought I was untidy until I moved here. The fact you'd have to pay almost twice as much for a crap one bed flat as you would for a room in a nice three bed flat is a factor as well.
But yeah, Toby is right, I'm not particularly arsed about people using milk and stuff. I'm quite easy going as a flatmate. Aldi is a fair old walk though.