Butter Mojave BEL

I was just curious about the BEL's with Butter/Mojave.

You don't hear about them that often, why is that? Are they more rare or the opposite and common? How much do they usually go for?

Found only one online and it was for $850.

I can't answer why we don't hear about them, but as long as my Mojave is ready, I'll be pairing him up with my Butter this year.