Searching the internet, there is a growing interest in having a laptop with ECC memory (support). There are almost no models out there that provide this.
You already provide premium class laptops, for a user base that are likely very technical and will recognize and want this great feature.
In addition to this, it will give Librem even more exposure, to the user base that perhaps don’t care too much about other Librem features, but that want ECC in their laptops and are ready to pay extra for it. There is basically no competition in this market currently.
UPD: There is one other manufacturer on the market that started doing this: Lenovo. This has to mean that they have done some sort of market research and that there is real demand for this feature.
However, as many of you I’m sure know, Lenovo has been shown many times to be an untrustworthy company that install spyware/malware in their machines. They have been shown to use barely documented Windows features, to install their own services on clean install, using less-known BIOS options. They have been shown to replace files in the filesystem from BIOS (on older Windows versions). This is a big problem privacy-wise. Currently a lot of people would not trust Lenovo laptops or computers for anything privacy related.
So you see, Librem might just be a good match for ECC memory: they would have only 1 other company for competition, and that company is the one that is not going to be trusted by the community privacy-minded users. Librem is definitely much better on this front than Lenovo.