Getting the grocery bonus clawed back would be less of a concern than getting your MR account shut down after Amex considers you abusing its T&Cs, especially if you plan on purchasing GCs to fulfill your minimum spend requirement. I have mentioned in another thread that if you purchase small denomination third party GCs along with your typical grocery runs, I don't think Amex would give you much trouble. If you start purchasing $500 GCs on a monthly basis, I won't be surprised if Amex decides to scrutinize your account(s), which is probably not something you want, IMHO.

LAX