You must be a stably employed person who worries not at all about each and every dollar you spend.

Some of us scrimp every single dollar to afford things like the high dollar down bag, because we must prioritize. The cost difference between a canister and the same amount of denatured alcohol may not be significant to you. That's fine, but it's not true of everyone.

I can get a can of Fancy Feast at the dollar store, feed it to the cat, and have a working stove after a minute with a hole punch - contrast that with spending eighty bucks for a canister stove and there's a huge difference.