Why dont we have a slots machine that takes gold coin, guild coins or gems. Obviously depending on what resource you use you will get the chance to win better items. At the moment all we have are the mystery crate and the tricis supply crate which seems over priced for what you usually get from them. At least this way players of all levels and whatever funds they use for gems or not get a chance to win something.
And before anybody says about gambling that is exactly what your are doing buying the above two items.