Does anyone have experience pricing landscaping and snow removal work in the northeast?

I know this isn't a search question but there are several landscape operators on here that may have some insight.

Primarily talking about snow; is it best practice to price per sq ft, per inch, per storm or some combination of this on a seasonal contract? I've seen massive estimate swings from a few thousand dollars to $100k to plow a few of my apartment properties for a season. Most folks won't even give me an estimate or require that they have a year contract for landscaping too.

With the density of resi & comm apartments and warehousing in my specific location, this leads me to believe there has to be a demand for a responsive, data-driven snow removal business. Will continue to research this market...