Just came across this thread. I started a stump grinding side gig in March. Last year I bought a Woodland Mills wg24 grinder for my 850 John Deere. The tractor has a grapple I built a while back as well. Luckily I had all the equipment so that jump started me. Started by doing a few jobs for people at church. After 4 or 5 jobs I started investing heavily back into it. I live in a major summer cabin/tourist district with lots of people from out of town visiting their cottages. Rolled my profits into building a website, insurance, business cards and a social media blitz. Just recently I purchased 25 yard signs that say "stump grinding, insured (with my number) and put them everywhere. That was 3 days ago and I already got 2 calls from them. One job was 32 stumps. Right now I price stumps in increments 10-15" , 15-20" etc that will probably be modified some. For smaller stumps, say a guy has ten 4" stumps. I measure at about 4" above ground, add up my inches and multiply by 10. $10/inch, I am planning on going to a flat rate of $10/inch for all sizes. If a guy has one 5" stump it's a minimum of $100, if it is taller than 8" it's subject to a cut fee. I like jobs with 5+ stumps, that usually equals out to $4-500/hr. Sometimes my machine can make $700/hr, each job is different. Small jobs make the least but still usually around $100/hr.