I think everything, if written as such and explained as such, can intertwine. The problem with having multiple levels of the forum could be that you have crossed-topics, or the same thing talked about twice. Things do relate. For example, had there just been an AIR-only miles forum and then a hotel only forum, then youd have problems trying to convert miles from say, UAL to Hilton Honors!

That's just my opinion. Everything does and can relate. I try to make my posts, even the ones filled with just theory or philosophical miles-related questions, be related to the topic. That is the best way to keep it in the same family, I bet