The combination of pollution contaminated water, dissimilar metals and direct current voltage wreaks havoc on satellite tv installs.
While most of the industry doesn't care by using the minimalist life design concept by using components that are expected to last no longer than a 2-3 years, those wo want long term longevity in their systems will almost always place all of the connections out of the weather or on weatherproof enclosures.
The direct current used in satellite tv lnb switching and control causes much more corrosion than the extremely low voltage modulated signal in cable tv systems.
The industry prefers to low ball s call "free" installs that are designed to last not much longer than the commitment or "chargeback" period.
Good point, here is a pic from a so call local dealer did an installation to a customer, I did went back there within a week when customer called dish which I still work at that time. this installation is not codes and should not be say quality but hack job.
These are the companies that refuse to spend an extra five dollars (in large quantities) for a weatherproof box. I do only high end custom AV antenna and satellite installs. I perfer to use weatherproof boxes to enclose switches and grounding blocks, when they are exposed to the weather. Even 5 year old connections show nothing but a patina from air exposure, when examined.
The same thing happened in the telephone industry in the late 1970's, when telephones could be purchased by enusers. They became cheap limited life throw away items. Company owned leased equipment had a design life of 25 years plus. It is not uncommon to find telephones from the 1920's still in working condition.