$300 could pay for all the wood and part of a um18 for a second submaximus
I wont be able to this time, but if you guys have another I may have to look into that for sure.
From a financial perspective, it is a small price when compared to overall costs to build your own complete setup, the amount of information you gain from being among the theaters you are visiting as opposed to just reading about them on these forums, and the experience of being around other like-minded individuals (nerds) who share this crazy hobby.
I've learned vast amounts from the Chicago and Minneapolis groups over the years, to the point my brain was starting to smoke (or was that my ears?). Luckily there is usually copious amounts of barely pops at these events to remedy that.