That just defeats the IP part of the KVM and in that case you'd better stick with a traditional KVM.

Video cables and USB cables were never designed for a 20m run. Most have difficulties beyond a 2-5m distance.

My servers will be in my basement, at the other end of the house. My C&C machine will be in my office. The entire purpose of remote KVM is such that I don’t have to hoof it all the way down into the basement just to do something quick. Or go back-and-forth if there is something in my office I have to reference while doing the work.

In fact, I suspect that network KVM is exceedingly useful for anyone whose machines are more than five steps away. Even across the room makes a hell of a lot of sense.