Great! Send me the money to have dinner on you!
Or, did you mean, why not do a dinner shop for us? A mystery shop is work. It's not having dinner "on you." It is exchanging work for that meal. I like ACL and am happy to work for you, but please don't discount the work involved.
"Let me offer you my definition of social justice: I keep what I earn and you keep what you earn. Do you disagree? Well then tell me how much of what I earn belongs to you - and why?” ~Walter Williams