A fast food shop for $13 is good fee if this is on top of re-imbursement.
One company I work had been rewarding re-imbursement only for a particaular fast food restaurant. The report is easy but they have now reduced the rate to $5 but expect you to buy a meal that costs close to $7 - now why would I want to do that shop?
I have done some family and fine dining establishments and it can vary between re-imbursement only and a small fee. The reports are detailled and require quite a bit of narrative. Like Bonnie, if it's somewhere I would usually go or would like the oppurtunity to try then I'll do it but some are a lot of effort.