The DMG only states "anything in the adventuring equipment tables" which includes reagents on that table. By the same argument, one could get infinite everburning torches.
I think thing anything sellable at more than 20% (reasonable things like reagents and everburning torches) probably shouldn't be included in the "reasonable". Likely, put a "judges have the right to reject unreasonable mundane item selection" in the character charter and be done with it.
Another order of business: Modifying/nerfing anything in the sources we are about to import (from my post above, anything in a hardcover book that isn't setting specific). We could just do anything L4W did, but perhaps things seen as broken then are not so much any more. Or we could look at them again. Thoughts?