My PodHD actually increased my gas. After getting acquainted with a couple of models that I like (Diveded by 13, Dr. Z, Plexi model, Engl Fireball preamp) I actually want to buy the real amps. That's one thing I think will start to happen with modeling, especially now that it's getting more realistic with the Kemper and profiling, is that people will be able to buy a modeler and use it to see what tube amp they want to buy.
On another note, last summer my band played a lot of gigs and
that made my gas go bye-bye! Didn't matter what I was playing through. Just being up there playing to an excited audience made me forget about the gear completely, so I could focus on why I started playing guitar in the first place. Now that we haven't played a show since Thanksgiving, I'm back to my gassy ways.