All good points, ST, I expect nothing less from you at this point.
As far as ceiling height goes, in the two venues I have mentioned, I have done what I can to make it work and in one case we can't use the Bose at all, in the other the only option available leaves one of my L1s at risk. I have played these gigs on several occasions but the above solutions are the only ones so far. And I fully expect to play these venues on a fairly regular rotation going forward. So for me even, if I never encountered another difficult space, I would bring the hollow extensions every time I played in one of these rooms. Might even just bring them along if we are playing a new space for the first time, if I don't need them, leave them home next time I play that space. It's all about options for me. And of course it might come down to $$$ too. If the price of the hollow extension was ridiculous I might just suffer through these gigs, I mean let's face it right now I don't have a choice.
And as far as selling people on the system, maybe I'm a little selfish on that point. The main people I would be trying to sell are other band mates. So they could try them out at rehearsals and get a real feel for it. They all know the model 2 works but it's more expensive, I was hoping a 1s might m entice them but I wouldn't even want to hazard a guess as to whether it will cut it in all scenarios.
As far as selling other musicians, like you I am happy to discuss the Bose gear and if they stick around and watch our band the system pretty much sells itself. But otherwise I'm happy to have a bit of an edge up on sound over the other bands in the area. Bar owners love us we can fill a room with nice clear sound without killing anyone with volume. Not a lot of other bands can do that.