I think maybe we have just 2 official GBs a year, each 6 months-ish and its ok if they overlap, but heaps of promo on them, and prizes. Then maybe the others could be like the Phantom Gb which is just for fun?
Trouble with that is what do people do when there's a GB and it's not something they like, they then have to wait 6 months and maybe get something they do. End of the day no one has a gun to anyone's head, you don't have to enter every GB just pick the ones you like and build what you like.
'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'