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Less friction
Block chain has more friction than roller chain, that's why we switched. Wippermann make a bike-sized 1" pitch roller chain which might be fun to experiment with, but chordal action would be pretty bad on a 7.5 tooth sprocket.
gbj_tester-
That pitch roller chain looks monstrous like a small motorbike's chain. Initially I thought that they used roller chains in combination with skip tooth chainrings in order to reduce friction and save weight. I thought that the idea behind it was that you could just get rid of half the teeth since you have a straigth chainline on track bikes anyway.
Sig_Arlecchino
What's the deal with skip-tooth chain rings? Less friction I guess, are there any other advantages? Why was the concept abandoned?