Well its easy to get referals, but its hard for them make deposits and start gambling with the same house, the way i see this being possible is changing side from player to owner of casino or dice, otherwise may try to refer others but its very hard to get sucess into it.
Off course you are right it isn't easy at all to make money from referral. You need to work really hard and on constant basis in order to get some income from this way. Nothing is easy my friend application of any suggestion or idea is always harder than theory.