Probably very few people switched from Windows 98 to Windows 2000. That wasn't considered an upgrade path. That was installing a different operating system.
Technically Windows ME existed, I guess.
As I used to be big into UNIX in the early 2000's, I used to dual boot between it and Red-Hat, eventually I got fed up dual booting all the time depending on the project work, or client support, and ended up using Windows, alongside Humming Bird X Server to connect to our development servers (yep back when we were still time-sharing UNIX servers for coding tasks).
Whether or not many people would want to do that upgrade/migration is another question, but similar to you I doubt the number was high.
I was one of them. I went from ME to 2k and it was definitely a big step up.