I run the higher octane for a couple reasons... Look at how much timing I run, and what size domes I have. I also have some 16cc domes I put in depending on what I'm doing. My compression is high enough I would at least need to run 50/50 at this altitude and since I just about maxed out my timing plate I went ahead and run the higher stuff we make.
We make our own fuel. Its a mix of a bunch of different things, the combination actually makes the higher octane rating, its not like I'm going out buying something that high, its just a side-factor to the "manufacturing" process we use and some of the ingredients.