My thoughts on this are: Have a mix of Wyrd-only and anything-goes. Like I said, I really appreciate that FF, RH and TT are anything goes, but it's worth noting that I felt like I should have entered a Wyrd mini in them, even though I didn't have to. As a way of saying thanks or showing appreciation, I think. Because you didn't make me, I wanted to. Admittedly, I failed to do this in the TT and RH comps that I've entered so far, but in my defence, I didn't have any suitable Wyrd minis for TT and I tried to redeem myself by buying some for RH but still haven't got round to painting them! D'oh! Of course, this is just how I feel, but it may well be that others feel the same. I think if that's the case, it might be better to keep some competitions open and the goodwill this would hopefully generate towards Wyrd would show across all the competitions.
At the end of the day, Wyrd is a company and I'm sure everyone here knows that you can't keep a business running on fresh air and none of us want to see Wyrd fail, so I would sincerely hope that people are not averse to spending some of their hard-earned to support Wyrd-exclusive comps in gratitude for the open ones.
Another thought occurs: You might notice a decrease in Wyrd minis in open comps in favour of entering them in Wyrd-only comps. Keeping the "Best of Wyrd" prize might prevent that happening too much, tho.