EGT probes are a compromise.
You want them to react as fast as possible, which means you want the metal around the probe to be as thin as possible to have the lowest thermal mass. However, making thin metal that survives at 1,600F in combustion gasses for thousands of hours is a challenge.
So, you can go with thick metal, and deal with the fact that it can take 20 seconds for the temperature to read right. Or you can go thin, and deal with the fact that after a long time, they will burn though.
The rate at which they burn through has everything to do with where they are and how you operate your engine. The closer to the valves they are the hotter they run and the quicker they wear. The more you run LOP the nastier the gasses are too.
Dynon has had two probe types over the years. The first were stainless, and were fine, but about 4 years ago we switched to an Inconel sheath which does better in the exhaust environment. All our probes are "fast acting" meaning they prioritize speed of reaction over long life. As most people appreciate with Dynon, they do also prioritize cost. Note that our probes are only $36 each, and you are getting an Inconel probe at that price.
Now, if you actually burned though one in 75 hours, that's not normal. In our experience, an engine running about 1,450F cruise should last around 1,000 hours. My plane has 800 hours in 3 years and runs LOP all the time and all the probes are still fine. Runs about 1,500F in cruise.
With your SkyView, you can run any K type thermocouple for your EGT. There are lots of vendors, and some may be more robust. Generally these will cost more per probe and will be slower reacting, but electrically they will work fine with SkyView (or any Dynon EMS)
--Ian @ Dynon