You indeed were lucky, indeed, to find a grinder and then sell it for more. Good job! I have considered renting a stump grinder. I don't have too many stumps to remove (maybe 10). It could probably be done over a weekend, or a year using my method :).

My hat is off to the old timers that cleared land without bulldozers. I am always amazed how strong roots are. I am glad I don't have 80 to remove, like you did.