Well, I can say I've seen a Mac die a slow death by salt air before:
There is a
solar hydrogen generation project that basically got the lab I work at started. Before I re-did the control system for it using more modern hardware, it literally ran on three old Macs: Two SE/30s (I think... might have been a different all-in-one model) and a IIfx (which cost more than my G5 tower and loaded MPB combined when it was new--I remember drooling over them as a kid).
Anyway, part of what spawned the initial system rebuild was that the IIfx stopped working. I was asked to take a look at it and see if it was something simple that had killed it. I cracked open the case to find... RUST. I have no photos (though I should get one--it's still in an attic somewhere), but nearly a decade of salt air blowing through the case (the project is about 200 meters from the ocean) had rusted the living crap out of the thing.
I pretty much said "It's a miracle this thing lasted as long as it did, but it ain't coming back to life now." Perhaps more impressive, the two SE/30s were running fine until the day they went offline 10 years after they went into 24/7 service. So far as I know, they still work.