If it helps, I have a SL which was driven for some 17,000 miles in its first year and now has less than 36,000 i.e in 10 years it has covered less than 20,000 miles and I have done 4,000 of those in the last 18 months.
The old MOT's show that some years it did less than 300 miles. It has always been garaged and I have had no problems with it at all. Yes it at one point went 4 years without a service (again due to mileage), but I can find no sign of detriment from this and my indi (John Haynes) cannot fault the car.
So condition is all, irrespective of mileage and from my experience low mileage is a benefit not a deterrent. The plus side is my car is truly mint, completely unmarked (and I do mean not a stone chip, dent or slightest scratch) inside or out. The downside is it cost well in excess of £20k in 2011 - yes I know you will all say I paid too much, but it was the best I had seen so to me was worth it.