Again, I'm wagging my finger at the GetBackers fandom here. It's mostly a problem of 'what's cheap in North America' vs. 'what's cheap in Japan'. The mains guys in GetBackers are living-in-their-car level broke, so naturally a lot of fic revolves around how these two manage to exist on 500 yen a day or less. People like to write about them eating a lot of pizza, because pizza is cheap food over here- but pizza in Japan is pretty damn expensive, not to mention the pies being much smaller. (We're talking 3000+ yen for what we would consider a medium-smallish pizza.) Also, the pizza they eat in fic has distinctly Western toppings- whereas Japanese pizza tends to have things like corn and mayonnaise and squid on it.

(There's a story about a friend of a friend who tried very hard to get a waiter over there to bring him a pizza with *gasp* just pepperoni- no corn, no mayo- and was told "I'm sorry, but we don't have the technology!")