Santi,
You could probably draw a lot of parallels between a Leica M6 camera (for example) and the Rolex Submariner watch you inquired about on your other thread. Both exhibit quality construction, ruggedness, durability, and very good performance over a lifetime of service.
Some might also say, however, that each is a bit on the heavy side, somewhat overpriced, and subject to admiration by those who are overly image conscious.
I happen to be a Leica rangefinder fan, so I can't speak to the performance of their SLRs or point and shoots, but within the M series of bodies and lenses resale values are quite high. This might not completely justify the high prices, but it does take away some of the sting.
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Semper Fi
-Bill