Where's the Vertical Exit?

Vertical Search is one of the hottest sectors these days, with startups being built to flip in every vertical and horizontal you can think of.  Reminds me of B2B, although there is decided value being created by many of them.

But doesn't it strike you as odd that there hasn't been any Vertical Search acquisitions?  I might be wrong here, but it does seem like a very big assumption that the otherwise acquisitive search players will buy instead of build.  Maybe it's just to early.

UPDATE, from comments:

• Shopping.com acquired by eBay
• workzoo acquired by Jobster