My biggest problem with a service like pest control is I can't tell what it does. I'm not talking about getting rid of a hornet nest or squirrels in the attic, I'm talking about the door-to-door salespeople who want you to subscribe to a quarterly sprinkling of some magic dust around your house. If I could get a trustworthy measurement like "number of 2x4s not destroyed by carpenter ants" or "sqft of siding not rotten because of nests" I would be a lot more open to it.
For the d2d residential services, you're buying peace of mind and usually the provider will guartantee the service. E.g. if you see ants and you're not due a visit until next month, they'll drop in and sort it.