Main problem I can see is that if you win a few times your original stake, then there may be no point in carrying on if all you want to do is pay your hotel bill and are not really into shopping. Personally I would probably try it once for the experience, but would not bother again if all I could win were vouchers to use in their own shops (especially knowing that they then make a margin on the retail sales!)

I really can't see it catching on in England where the casinos are not part of larger resorts and so no casinos here have shops or even hotel complexes - apart from the restaurant, there would be no-where to spend the vouchers unless they issue vouchers for other stores, in which case they will be competing against casinos that pay out cash - which would you choose????

Jason