Shorter Variance - 4 hour suggestion?

[Xerical]

Is there really any benefit to 16 hour variance vs. something like 4 hours? What is the gain that the GMs/server mods see in having such a long variance. I understand that variance is needed on this server because of the un-classic population types. But we've seen that every guild has people willing to sit in front of their screen's staring at a spawn for as many hours as it takes to get the dragon. There is already enough time-sinks in this game that get us to raiding (like camping pained soul for 24+ hours strait). Why not promote a healthier lifestyle by reducing the variance to something that still scatters target spawn windows and creates competition but doesn't kill the people in the process?

So far the only answer I have received from people against shorter variance is "No, I have time to sit here and I want my DKP"... /facepalm