I'm interested because it seems like an easy way of keeping low-bb bikes off the track that may net a few false positives. Like if I had a regular track frame and just for S's and G's i had someone put horizontal dropouts on it, it'd be hard to justify keeping it off the track.

Fun Fact: the burnaby drome requires that spokecards be removed, to prevent them from flying out and causing hideous paper cuts I assume.