I and many other people remove ABS, as we've had unpleasant experiences with the system. That was MY reason, but others do it for the slight weight reduction. I'm not going to argue about the valve anymore; as we all have our minds set and it serves no purpose.

In any event, he hasn't responded back; so he's either given up, or he's doing research.

[edit]
I'm an EMT, so that's the "mystery" behind my username.