Some people will tell you that what you use money for its achievement will tend to last more than the one that just comes on a platter of gold, we should know this for that reason, free things are sometime unpredictable and their value may not be as up to to the quality of what we get when we are actually using our own earned personal money for gambling, i don't know what's behind this, but that is how it has been for some time now.
When we use money to get free spins, the results we get will also depend on luck and I think it's the same as when we get free spins on slot games cannot be known for sure, so when we are playing on this type of slot game then we shouldn't expect too much to get bigger results if luck is not on our side, then the results we get from the spins Free is certainly not big and if you manage to get good results from free spins when using personal money, of course luck is on your side.