Thats pretty much the same for me.
If yoi go to a normal (not fancy) restaurant, pizzeria or so u usually drop aroun 5-8 euros where I am at.
If you go around mid day to get a lunch menu thats usually from 3-5 euros.
And of course then there is the the upper level that are 8+ and the fancy ones where you drop bunch of cash, but I never go to these, when I can get good food much much cheaper elsewhere.
As far as my next purchase on DMM goes - once again I am waiting for the Pick you waifu ticket. Unless they do something like Nutaku where you pay lets say 2K dmm points for a specific girl (one that you like), in that case I would go for that.