This is a great question, though certainly not an easy one to answer. I am not convinced that such an advertising method would be an effective way to enroll PRMs. Let's say that you have a PRM sign-up, uses the gift card you have provided, and plays one of the Eager Zebra games. What happens when they lose and have used the only TCredit the gift card provides? How likely is it going to be that they will grab their wallet, whip out their credit card and purchase more TCredits to keep on playing?
Now, let's say that same PRM instead uses their TCredit to list an item for sale. When they sell that item, it is much more likely that they will utilize a part, if not all, of their profit from that sale to purchase more TCredits so they can list more items for sale. Then would be a good time to encourage and motivate them to use some of their TCredits for playing the Eager Zebra games.
This is a great question, though certainly not an easy one to answer. I am not convinced that such an advertising method would be an effective way to enroll PRMs. Let's say that you have a PRM sign-up, uses the gift card you have provided, and plays one of the Eager Zebra games. What happens when they lose and have used the only TCredit the gift card provides? How likely is it going to be that they will grab their wallet, whip out their credit card and purchase more TCredits to keep on playing?