I plow commercially ,I have 15 lots and 10 paying driveways ( long ones)  . Its my business . During the last storm I plowed 3 miles of county road and all the thru roads in my community  2 times . First because I wanted to be able to get home , second my parents are in the same community and 80 years old , plus there some elderly neighbors.  Fire dept could acess. Now there is a small court behind my house , 10 houses , $ 600K homes . They called and asked me to plow 30 inches . Too much for the truck . needed the tractor . So I told them  sure , it will be $ 400 .  The woman said let me check with the neighbors .  She called back and offered $ 50.00 . I was nice and told her , plowing is my business , $ 400 is the price , yes you are neighbors but I have a full schedule for 3 days and have had no sleep . Then she got a bit rude and said " I thought you would want to help neighbors out .  I then asked her , " Do you go to work all week for free ?"    
It boils down to , if you want to plow for free at your leisure then do it , if not then sit home and let the neighbors wonder how they will get out .   Now prices are regional , but if they had to pay a contractor , they might as well help a neighbor and pay him the same .  Everytime you run equipment you run the risk of damage , there is wear and tear , plus time is money .