The home folks don't give too much thought to this,but there are a lot of applications to disposables.
Large rolls of HD foil,and HD plastic wrap are worth their weight in gold.
It brings the cost down drastically, and as we cook more, we,or the co-cook don't spend any time salvaging all those things that go with cooking.
BBQ,or in the kitchen.
A plastic bag of half pans go with everything in a smoker,and many things in the house oven.
At a grocery,one costs more than the food inside it,but at a box store,you don't know how you ever lived without them.
When you go to the picnic,the awards potluck,all the kids functions-you just walk away and leave them.
Especially nice, when you are trying to slip out,and don't want to be caught trying to remove your pyrex dish.
At cookoffs,vending,caters,etc., we line and throw most everything.
Speed,labor costs,or the pleasure of not "having to stop and clean it"
They don't take much room to store-when you compare them to all the pans we store,and have to SCRUB.
Just a couple of thoughts.