I do a very low mileage, rather less per year than you. I use my car mainly for lots of short trips really, which probably isn't good for the engine as it is only just reaching proper operating temperatures as I turn it off at the end of the hop.
As it is now out of guarantee and has had a full service this year I may well skip the service bit next year and just get it MOT'd (rego I think you call it there).
Having a stamp for each servicing is good when you decide to change car. Buyers like to think the car has been looked after.