^^ I have basically done something similar, but the reward money is coming from money I was usually spending on fast food. A typical day for me started with about $3 at tims for a coffee and donuts or bagels plus about $12 for lunch/snacks at the food court near my office. now, I didn't do this everyday, but enough so lets say it is about $50-60 per week buying crap. Instead, now I am having a meal replacement shake every morning and I am bringing my lunch in with dinner leftovers. So the money I am not spending on breakfast and lunch is going to go toward a reward (car mods).