It definatley works , it used to be alot easier , since they had alot of offers that could be abused by sending teh same confirmation email back to them. I think in a matter of a week in change with the older system I pulled around 6 mil by using teh free cash from all 3 accounts I was using to buy trickboxes and sell them right off on the MP

Now its a bit more taxing since you have to fill out the offers fully , although there are still offers that work if you have a null credit card , like a greendot with no funds loaded . The cash system goes through , they realize they cant deduct payment , and there is never a retraction of gaia cash.