I save them up and usually farm my way over too them. There’s a bit of gold and sometimes the gear ain’t so bad. Got a purple spinners ring I sold and some other decent sellable gear. Mostly it’s trash but good for deconstruction. Use the add on on pc and it’s not a waste of time.
Why? It's good free material for deconning to level up craft skills on all my alts. Specifically jewelry and glyphs. Plus it provides some mats back ager deconning.
The treasure maps are leveled to your character, so you may want to hold them until you level up. That's about the only reason I can think of to hold them. Same with surveys.