If I can get 25% off delivery of a $20 pizza (cost to me is $15) vs a $18 carry-out.. is that repeatable? In my experience, those deals only work once. So in the long run, carry-out is still cheaper.
I probably ordered from that pizza place at least 20 times and the deals were always there. Things just work differently here.
The guy delivering it is going to be earning a woefully low amount.