I guess it heavily depends on the individual, for me however the fun element (of gambling specifically) is not there if the financial risk and reward is missing. However you can see in certain scenarios that some people get joy from virtual money/item gambling, when you see the popularity of things like counter strike go item betting. However even in that scenario there was a cash out value inherently linked to each item. I remember playing virtual money poker and it is nothing like the real game because the tactics seem to be missing in comparison, nobody wants to wait around 20 hands for the perfect combo when so little comes of it.