OP here. Not a trick question. I thought I recalled some pictures of guys running 3 of them. Wanted to hear from them if they felt the third cab was worth it.
It could be for show, to hear themselves because of height, or because they felt that they needed the additional cab for clarity/SPL. It could be their drink was at an inconvenient height.
There's a GS112 on the local Craigslist that I'm trying to convince myself to pick up. But, it's rather expensive if the only benefit is that of a spacer.
Oh, and don't worry about the 2.7 ohms that the 3 cabs will present as a load. My amp can handle it. If I didn't get that right, my EE degree would be revoked
js