and trolly snacks are really expensive and he gets out less than two gallions that's not very much: There are a number of different calculations about the value of the individual pieces of Wizard currency. The author has stated that a Galleon is worth about £3, and also that it is worth about £5, in two separate books, and again that it is worth about £5 in an interview.
Canon also means a storyline or part of a storyline, or an element, that is recognized as official by the writer. The seven novels are all canon, whereas fanfiction is not. If the author says they can't create food out of thin air, it's canon. If a fan says they can, it isn't.
Hermione: "Your mother can’t produce food out of thin air, no one can. Food is the first of the five Principal Exceptions to Gamp’s Law of Elemental Transfigura—" Ron: "Oh, speak English, can’t you?" Hermione: "It’s impossible to make good food out of nothing! You can Summon it if you know where it is, you can transform it, you can increase the quantity if you’ve already got some..." — Hermione Granger and Ron Weasley on the exceptions to Gamp's Law[src] sorry guess they can duplicate it, who knew.
I aggree, especially since the grownup wizards do what they please but the heros only perform recognised spells, it should be point & think. neather the books or films mention anything about combining spells even the idea that the words of the spells get you to think the right thoughts so you can make up your own later falls down when you realise that noone speaks latin anymore the whole "potterverse" is full of holes like this.
When commuting to see my boyfriend by train I told him about my trip and mentioned that I got some lunch on the train from the trolley cart. My boyfriend (who lives in farmer country in the UK) said "Trolley cart? I thought that only happened in Harry Potter."