What if three people (good friends) all joined WGT a year ago under different names and credit cards: Legitimate.
But one of those 3 is a highly skilled Master. So he actually uses all three WGT players and wins tournaments and earns career earnings. His friends are okay with this, they are in on it. If he actually wins money (gift cards, ect), they can all share the profits. Or, they might just let him keep all the gifts, or whatever. Either way, you can see how people can work together on this.
I think people are doing this and so I think for those of us who use just one name, we are up against a lot of problems.