Well, if I order a large Meat Lovers, it is far too easy for somebody else to change it to half a small vegetarian. Then add 15 people, all wanting to screw with eachother, and it is far too easy to stuff up the whole thing.

Perhaps "gaming the system" was not the right choice of words, but I wanted to note that the author of the article seems to go to great lengths to stop this sort of abuse.