I used to do Market Force, its been a while. I seemed to only be able to do McDonalds. It seemed like a lot of little rules (eat at this time, watch this, do that) to the point I had a hard time remembering what to do. It was hard to watch what I was supposed to and make sure I did everything. Twice I threw away the receipt, Duh!!!
For my prep time, gas, time there/back, writing review and getting all paperwork together, I did not make much at all if you average the pay by the time spent. I gave up after a while. Stressing myself over such a small amount of money was not worth it to me.
Others may have different opinions, but I won't do it again.