I run a rather high drop myself.

For me it was done for two reasons:

1) performance: Less wind resistance means I can ride longer, or ride faster in heavy headwinds.

2) comfort: I have too much bend in my wrists on a higher bar, so I run teh bar as low as possible, so that my wrists are more relaxed. Of course my beer belly and my drops don't play well together...to get into the drops I have to fight my stomach, but on the tops of the bars to the hoods, it's pure comfort.