I was curious if anyone is buying then selling gift cards acquired from TCB / Plastic Jungle?

Topcashback:

Plastic Jungle

2.5% cashback for selling gift cards

2.5% cashback for purchasing gift cards

Example:
Walmart selling for 96.5% of original value, PJ is purchasing at 96.6%

Concerns:
- Limited quantities of certain gift cards for sale
- The terms on TCB say that no payments will be made via PayPal, so what is the typical payment method most choose?
- Are purchases posting normally for people? I've seen TCB has has problems with Amex GCs.
- Any problems with getting banned from PJ for buying and selling the same types of GCs?