I do not think your SA really told you anything other than an attempt to sell a warranty that I bet they get a commission out of. A lot of vehicles are expensive to repair but the real question is how often does it need repairs. To give an example my simple truck is far from cheap to repair, for example between a relay and injectors last year I was out something like $4k. Some of the costs I have seen quoted for the 335d repairs I found amazingly lower than I'd imagine such as transmission replacements.
--Admiral Aaron Rouse