You quit and then think, maybe it was my fault. You get burned again and say that's it. And tor what ever reason (a free dinner close to home, lunch on the road or maybe a great hotel shop) and you try again. Mystery shopping is hard, takes a lot of time, miles on your vehicle and you get hammered on taxes, even if you know how to "Play the tax game".
The only reason to keep shopping is to take,only easy shops, close to home and stay under $599.00 per year in earnings. If you can do that, keep shopping. If not...it is time to get out.
Good luck. It is frustrating but we all need a little, very little cash we earn with this terrible economy,