Can you do some kind of wood floor over the gravel? Maybe end-grain cut-offs from some lumber mill? (Treatment of some kind may be in order for durability, fire, etc.) Not a cure-all for sinking in, but might be a step up from the gravel.
I started to think along these lines and quickly came to the conclusion that I was wasting time when I should just write a check.
I think that that is sort of the conclusion all of this has me at as well.
It would probably cost me $3/sq ft to do the dirt floor....might as well pony up and get something more useful.
Sucks. But that's life.
Sent from my iPhone using Tapatalk