Bankers have no attackbonus and therefor it is kind of a waste. On top of that you might not even want to spend stuff on bombers for bankers anyway. So if you want corecleaning before it gets defended, speed will do you more good.
In defence perspective it is a plus, so if you don't want to use the points for ops, you should take it.
as for food costs, i'd say: for a popbanker who already needs much food, this hardly makes any difference. It would be nice for a cfbanker who has farms to cover his own foodcosts 
verdict: in hardcore galaxies I'd take it. in normal galaxies not!
You disappoint me zidi