If there are other adventuring parties, why haven't the low level dungeons all been looted?

[jasper]

Don Donald Dungeon Dwelling Designers
You say some player characters have just loot the lost mines of never door?
You say some player characters have just fixed that snake problem under Hoggy Warts?
You say some guy name Henry from Indiana just looted your tomb and your back up blow gunners blew it?
You say you accidently ordered the Mommy’s Curse (I hope your kids grow up to be just like you) instead of the mummy’s curse, and your sacred sites in Egypt are being robbed?
You say some short stuff with Airborne Eagle wings took your hoard?
Don Donald Dungeon Dwelling Designers has the package for you. Just for 99.99 GP you can get our free brochure. For a modest fee (IP rights, story rights, gp, soul wrights) we will restock your haunted places.
Please send GP or XP just for reading this advertisement.

 

[Thomas Bowman]

Lets turn the question around, if you are a group of high level adventurers, why would you waste your time with a low level dungeon. Low level dungeons don't have much treasure in them. If you are a high level adventurer, a 100 gold piece horde does not look like much treasure to you, is it worth your time to kill a tribe of goblins to snatch it? Low level characters outnumber high level ones, and so do low level dungeons. At high levels, your characters can raise and lead armies into battle and collect your treasure when you defeat an enemy army.