OEM profile is the company's particular profile. For example, my Leopold has a very flat, almost SP-Gamer cap profile, on them while my Filco has a profile that is a taller DCS imo. As a community, we just happen to like the Cherry OEM profile. If no one special requests it, then it seems like they don't want to make someone else's shape. I think a good example is a Corvette. Even the newest model still has the classic Corvette lines. You won't see them stealing the main Ferrari body lines and calling it their own.
Edit: I like Cherry profile too, I'm just offering up a possible explanation.