The cost is for the total of the years not 1 year.
I used their very best (ie most expensive) service for 8 or 9 years including their grub control. I still had grubs, I still had weeds, they would come at the wrong times sometimes almost 2 months apart and then give various excuses for why their products didn't work. Their technicians ( pronounced students ) would sometimes literally run around the property to finish faster (under 10 minutes guaranteed) then onto the next job. They would order you to water the lawn for two days straight for an hour to two hours ( you would be still watering at midnight). The kicker came when they explained our dead grass by saying a normal lifetime for a lawn is 20 years. When I researched this bizzare statement I found documented proof that lawns at Buckingham Palace are over 400 years old. I then kicked them out.
By the way I've been doing my own lawn for the last 4 years. It costs a little more the first year. After that it's cheaper. And my lawn always looks better than it did with them.
They also have very little regard for the law. I am on the Federal do not call list since day one. And I have not dealt with them for over 4 years. Despite this and my requests not to be called they call me once or twice every year in the early spring.