I think having deck list competitions can be a good thing in multiple ways. The contests can help people become better deck builders with their own cards for starters. Some people can get bored of seeing here's my deck, now fix it threads. New combos can emerge from these contests, such as Blastoise being used to power up Charizard SF. By holding competitions, it may help people decide what to play at premier events. I think it would also be a good idea to open up some theme only competitions where there is no specific card given, but rather a theme. There could also be a possibility to take a common deck type, such as G-Toolbox, and see who builds it the best. I think that each person should only be allowed to host one contest at a time. Then that person should have to wait a week before starting another.