Hey there tinted-snow, I just chimed in on your hypothetical (your words) scenario on the legal forum here. Good luck. Hope there is a cache there for you. And hope you get to keep it, etc...
The average cache you hear of in md'ing circles (even the one in Alaska that a miner might-have-buried), tends to be in the class of "bread and butter" caches. Eg.: Joe Blow, or farmer bob buries a bunch of coins in a jar. I've found many such scenarios (admittedly mostly on posse hunts for the next-of-kin). And NONE of them would be something you/I could "live" on. Even one that I found that was filled with gold coins, *might* have justified my living standards for a year or so.
And as for the types of caches and treasures you/I *COULD* "live on", I'd say that the vast majority of them are in the category of camp-fire legends, ghost stories, etc.... Fun to listen to. Fun to muse about, but .... nothing but ghost-story telephone game.
A few lone exceptions exist (Mel Fisher, etc...). But beyond that, the rest of us are happy to pay for their gas, batteries, equipment, etc.....
That doesn't address TH'ing venues such as nuggets, gold-in-natural state, etc.... I was assuming you meant caches/treasures, right ?