I liked the idea of an HMVF only show, but thinking about it that might be construed as being a bit elitist.MVT Imps members etc might feel unwelcome, whereas a general MV show everyone can attend. You could be in danger there of splitting the "traditional" groups, or alienating them from using web based forums like this. I think being a member of MVT and HMVF complement each other. Although I do think some people have yet to realise this, but through no malice, it just depends if you are familiar with the internet and using forums.
Just my thoughts.