I think binoculars are where cameras were twenty years ago.
Top reasons that electronics fail:
Alkaline batteries. These things are ubiquitous and used by everybody and their brother. But, after a while, they leak. When they leak, your electronics are toast. If you value your electronics, use lithium batteries. They are much more expensive, but they don't leak and won't ruin your valuable electronics.
Moisture. People inevitably get their electronics wet, either in the rain, in the bathroom, poolside, you name it. Even very humid environments can lead to corrosion and/or shorting. Seaside residents have a tough time of it (think I read a statistics somewhere that half of the population lives within 50 miles of a coastal shoreline).
Poor-quality electronics. Cheap/poorly-made capacitors and resistors fail. When they fail, electronics fail. A couple years ago, my electronics-engineer brother was building 15" lcd screens for airplane cockpits that cost about $700. I asked him how they were different from the 15" lcd screens that I could go buy from a computer store for $75. He simply said that his didn't fail. They were designed to be waterproof, shockproof, dustproof, bombproof, pressure-proof, etc. Point is, electronics can be made quite reliable if you're willing to pay.
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Btw, a good thorough cleaning of electronics with some contact cleaner will go a long way to ensuring their longevity. There is one type of contact cleaner for new electronics, to protect them and make them last longer. There is another type that is made for old electronics, with scratchy volume dials, etc. Take apart that old radio, spray some contact cleaner on the volume pot, and it will work like new again.
Example: Here is a reputable contact cleaner...
http://www.amazon.com/Hosa-Cable-De...id=1459862143&sr=8-4&keywords=contact+cleaner
The red can cleans the electronics. The blue can protects the electronics from corrosion.