Oh HELL no. If deli stuff is included in that, count me out! No way in hell I'm stopping to slice meat and cheese for a guest who isn't even in the store. I have enough problems with guests who order one thing and promptly wander off.
I wouldn't suggest it unless you have free electricity, then maybe, but still even with dedicated mining hardware (your CPU/GPU are no longer fast enough for this) you're going to be very hard pressed to earn back the cost of the hardware now.
I mined Litecoins a few years back using my GPU when I wasn't gaming on my PC, made about $100, but quit after the difficulty increased so high and the price tanked I couldn't even pay for electricity with the profits.