You will quickly see there are actually only a few ingredients you need to worry about, as the majority are common and everywhere. Since I'm part of a small guild of just friends, a whopping 19 of it, half who barely play, we all stick all our provisioning ingredients in the guild bank since we have the space, but I still keep my tier 3 ingredients in my personal bank just so I dont risk someone else using all the pepper or whatever when I desperately need to make more purple food.
Also, I have sold food not even intending or trying to. I've tried to give it away the last 5 times someone asked in zone chat for some generic looted or green food and everytime they ended up paying me 500 or more gold for a small stack of green stuff I made out of junk I looted right then and there in a few minutes around town and tossed in a few blues if I manged to get a red wheat or something.
Food does sell, but a lot of people I find dont evenr ealizer just how powerful the buff is or can be. I keep a 2 hour, all stat, food buff on me at ALL TIMES I'm at risk of a fight. Questing, pvp, resource hunting, etc. It helps I put a decent chunk o points into provisioner, get 4 crafted food for each ingredient set, etc.