People spend more when they order themselves, when there is no one nagging or pushing them to make decisions.
Using an ordering system creates consistency as not all servers give good service, so this will no longer affect sales. An ordering system makes the experience more enjoyable, increasing sales.
Waiters only have a short time as they need to get to the next table, causing customers to feel pressured and pushed to make a quick decision.
When people feel pushed to make a decision it causes customers to resist and order less so sales are reduced.
When ordering on a phone customers can control the pace. An Ordering system offers consistency (that isn't guaranteed with staff) and presents their choices clearly, making their experience more enjoyable
Customers spend more and are more satisfied when they can order themselves with no pressure.
