And once you've got one, then you start thinking about how much cooler it would be if you had two. Suddenly you have two. Then you see bigger ones. And they're not THAT much more expensive than the little ones, and maybe you could sell the little ones to offset the cost of the big ones...

...repeat for a couple of years, and suddenly you have an LCD as your secondary monitor solely because your primary CRT is too friggin' heavy to lift.

Ahh well. As wobowikkles says, size IS important. :)