Oh, it's no big deal; what you said is true in terms of eggs being used to make vaccines.
But avian flu outbreaks require them to cull (kill) large numbers of egg-producing chickens, so it's basically a supply-and-demand issue -- hence the price spikes.
Speaking of which, I was in a discussion about that yesterday:
(I would link directly to these if I could, but am having issues with that.)
For what it's worth, Discuit is also a generally friendly place.