I started digging today. I started off with 3500, dug 14 shovels and ended up 2000 richer. What the heck? Is that the standard? I dug for three hours and that's what I get. Am I doing it right?
Well , no one forced you to ruin yourself .... If it's not giving you enought money just try another better way :p. in my opinion the best way is to get trash and mushrooms.
Watch a movie while you do it. I actually mined a lot awhile ago. Though I still have like 400 rocks out of the original 3000 or something to level up.