Let say the storage door opens and there is a extremely heavy object inside. Like so heavy you need a forklift to move it. Let's also say you could make a good profit on the item. Would you buy the unit? Why or why not?
A 6,000 pound generator on a pallet or a 6,000 pound marble statue on a pallet would have me turning around pretty fast.
The generator .... why was something that "valuable" left there? It's one thing to get a 25 pound Harbor Freight generator in a locker compared to that one. It would take a lot of guys from Home Depot and a good sized forklift to move it, and then where would it move to and with what kind of truck to move it. When it got there, what would it take to test it, repair it, sell it. I think my fast exit would be justified.
The above ignores part of your question above which is "Let's also say you could make a good profit on the item." The fact is ...as you should know...when we buy these lockers there is really no way to say with any certainty.... "I'll make a good profit on that". On a locker FULL OF STUFF the odds go up, but on a single item, no certainty. Buying price would affect it too, but buying a 6,000 pound generator for $100 is still no guarantee of a positive return and the work involved would have to be considered as well.
All of those thoughts take longer to type than they do to think about when the door goes up. Six K of heavy marble "art" is a loser too in my mind, but what the heck....it's just an opinion.