Why aren't there 0 lag monitors?

I'm going by displaylag.com, and the least amount of lag is 9ms. There's only 3 monitors so far that was covered that can accomplish this feat.

How many years do you guys think it'll take to get it down to zero? or at least 2 or 3 ms


Also, does anyone know if the evo monitors will still be the BenQ RL2460HT monitor this year?
Amazon says it has no lag, but according to displaylag it says there's 10ms worth.