That prevents me from being under the regulation that requires my system to automatically shut down when the grid power goes down. The end result is I'm not off grid as far as incoming power goes (when my solar isn't enough my system automatically pulls what I need from the grid). But I am off grid as far as outgoing power goes.
Or another way to look at it: to my utility I'm just an average customer like you, only I don't need power from them nearly as much. Just like you don't put power onto the grid -- I don't either. Just like you draw power from the grid when you need it -- I do too. Just like you don't have regulations saying you can't run a generator whenever you darn well feel like it -- I don't have regulations saying when I can or can't use my solar power.
You chose wisely.