Stump grinding?

Pennsyltucky Chris said:

Then, I have my truck, trailer and employee. I charge between $3 and $10 an inch, depending on the type of stump, how green it may be, and height.

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I just got some trees taken down by a local tree guy who just did a chop and drop. I cut everything up and rented a chipper for the branches/leaves. Now I'm considering cutting the stumps down low as possible with a chainsaw and leaving it at that, vs hiring someone to grind them vs renting a grinder.

What should I consider when bidding this out? Green vs dry, tall vs short, etc...