Certainly not on the outbound (beginning of a business trip). But on the way home from a biz trip is when I've collected the vast majority of my VDB comp over the years. It'll end up being the difference between getting home at 9PM vs midnight on a Thursday night...if those particular three hours net $500, I'm good with it.

I value my time more highly on leisure trips and usually don't VDB. Plus, those are often in J/F so I'm always hesitant to roll the dice on getting a good seat later. Once in a while, on the way home from a vacation, I'll score a VDB...but they're rare. Add in the fact that a leisure trip (for me) is often a kind of off-peak flight to begin with, whereas the biz trips end on Thursday nights (or occasionally a Friday afternoon) - a pretty solid VDB opportunity.