I can give you my insight as a former HYO moderator. I never actually counted to check that a host met the requirements of the rule, but the spirit of the rule should be considered - we have always wanted hosts who had a history of positive contribution to the site. In the past we did have "hosts" who were new to the site attempt to host, and the results of those games was quite mixed. Some hosts would abandon their game quickly. Others didn't seem to understand the flow of hosting a game on a message board.
So I would encourage you to post in many areas. In particular, participate in a number of current HYO's before offering to host. If people get to know you and sense you are have a good vibe, then they will be encouraged to join your show eventually.