Kristee -
First, I think that Bare International is a good company. In fact, they had what was, probably, my favorite shop of last year...a motorcycle clothing shop in a nearby town that paid $40 and went VERY well.
Second, I read where another shopper here figures that she has to make AT LEAST $1 per mile roundtrip in order to make a profit. For example: If a shop is, say, 7 miles from her house (or wherever she is starting from), that would mean a 14 mile roundtrip (7 miles there and 7 miles back). By her formula, she has to make AT LEAST $14 to make the shop, or shops if doing more than 1, at all profitable. You might try the same to help in deciding whether or not to take a shop.
Third, You might consider "bundling" shops together (doing more than one shop in the same town/area) to help make the trip worth it. In the above example, one $10 shop 7 miles away would not be worth taking (unless it might benefit you some other way). But, Taking the $10 shop, a $7 shop near the $10 one, and another $10 in the same area (or $27 total) MIGHT be.
Fourth, remember that, in addition to the fees you earn, the MILEAGE to and from the shop(s) is tax deductable at .505 per mile. This will help reduce your tax liability, making you a little more money.
Hope this helps. Good Luck and Happy (and Profitable) shopping.