Something else to consider – some of those folks who can’t clear their own walks may be on disability or retired on a small fixed income. They would not be able to afford to pay anything for someone to shovel.
When you know a neighbor is in that situation, put out the extra effort and help them by shoveling for them too. Or a yeshiva bochur could do this as a chesed project. A yeshiva might even take this on formally, the way some bais yaakovs have programs for visiting the elderly homebound.