Multi Engine Forum
I know why. And I vote NO, too. The subject is TOO NARROW. There are only a few questions about multis. Only a few topics. Within a couple of weeks, they will all be answered, and then it will just be a repetition of the same questions.
It's just not worth a whole forum for it. Instead, ask in the jets or warbirds whatever, or just do a search under twins.
I fly many multis, I really love twins, but I cannot see adding yet another forum to the site for them.