Welcome! We love to see that folks are reading and learning from other shoppers' experiences. You are off to a good start. And, grocery shops really can make a dent in your monthly bills! A of those reimbursed groceries are worth more than the $10, since there is no tax on the reimbursement! I haven't paid for an oil change since 2005!
A nice way to expand may be to try a few bank shops of the sort where you just interact with a teller, to start. Modest fees but you don't have to lay out any funds and wait for reimbursement and there is minimal role-playing required. Also, you can then move up to somewhat better bank shop fees by doing ones where you sit down with a banker at desk to ask about loans or other services. These can hep you build confidence and provide the sort of track record that will permit you to qualify for better shops with those MSCs.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.