Just a theoretical example to make the numbers easier (rounding off to 100k).
That said, I also can't find anything anywhere on what people at basecamp are actually paid (nothing on levels.fyi or glassdoor, I didn't search very hard). I don't know what "SV salaries" means but not everyone in SV is making the average or median salary -- some people will be under or right at 100k, probably very early in their careers or when a company is taking a flyer on someone with no credentials.
That said, I also can't find anything anywhere on what people at basecamp are actually paid (nothing on levels.fyi or glassdoor, I didn't search very hard). I don't know what "SV salaries" means but not everyone in SV is making the average or median salary -- some people will be under or right at 100k, probably very early in their careers or when a company is taking a flyer on someone with no credentials.