Yes, it helps. Contextual ads help me find new customers to market to, hopefully through relevant content that overlaps with my product, but what do I do with all those visitors that stop by and don't convert? Retargeting lets me capture that interest and incrementally improve my media spend - and on tens of millions a year in media spend, this can be significant.

I wish I had better alternative but unfortunately these are the tools we have to work with, and creepy ads that follow you around the internet are going to last until we figure out better ways of spending investor money without feeling like we're burning cash to the Advertising Gods.