There is no difference between using a note and a book except the book you need to sell in a shop chest, which can fill and often don't work
~ @agnd
The book not working is the fault of the person who owns the slots, which at that point you can ask the owner for assistance or if that doesn't work tell staff you won this and you need your prize thing to get it sorted
And the thing is, if there is no difference between a note and a book you can sell for money, except for the fact that the book is easily rendered useless in case of errors by just destroying the shop sign, you have no way of fixing a mistake with a money note accidentally put in the wrong place or dropped and the wrong person picks it up, think about buying something from person A, you drop the note, person B picks up the note, person B is not required to give it back and person A isnt required to give you the item cause you never paid him.
so all in all - This is only beneficial really when you look at slot machines, which are not complicated in the first place and don't need any fixing other than a chest filling up which is very easily resolved by the slot owner.
sssoooo... theres no point and people will lose more than there are benefits to this addition