Well, if you are wondering if you can justify the expense of a plow here's a few things that might help.
How big is the city that you live in? The more places of business there are, the more of a demand there is. Shopping centers, strip malls, medical offices, Day cares, senior centers, small-med sized companies with parking lots, churches, restaurants, etc. all need to have their walkways and parking areas cleared before the start of the business day. If they don't they risk possible lawsuits if someone slips on their property or they could lose customers/sales because of a lack of accessibility.
Also, I don't know about you guys but around here the tree biz slows down considerably during the winter months and when it snows it's nonexistent. So instead of sitting at home when the weather sucks, I'm making money!
All I know is I want/need to work year round no matter what mother nature throws my way and if I didn't have my plow I'd be screwed in Dec., Jan., and Feb.
Oh yeah, another nice thing is snow removal is not cheap so it can easily become very lucrative. I charge $100-$150 an hour to run my plow and $50 per hr for hand shoveling.