We have been contemplating adding ordering for a while now. To do it well, it's a non trivial problem with a lot of different challenges.

Restaurant online ordering providers usually fall into two camps:

1) Simple ordering that goes to email, fax, or phone. There is no integration with the kitchen and restaurants have to reconcile their reporting at the end of the day.

2) Online ordering website integration directly with the restaurant's point of sale system. This works better for the restaurant cause the orders can go straight to the kitchen printers, the sales reports are all in the same place, and the orders pop up in the point of sale system that the restaurant is already using. This is a lot more work (and a lot more expensive), and first you have to convince the POS manufacturers to give you access to their APIs.

Additionally, not all restaurants are interested in doing online ordering (it affects the workflow of the kitchen to have orders coming in 'out of band').

I wouldn't want to limit our service to only folks interested doing online ordering, but it might be an interesting add-on for us down the road.