My personal site is simple enough that there aren't any database-requiring features I actually want on it, and benefits of Jekyll include:

  - Just feels nice. I actually enjoy playing with it.
  - Cheap, I have it on AWS CF (a CDN) and it costs $0.10/month for
  a few thousand pageviews
  - Fast, with such few page views even wordpress would be fast enough
  for me, but I like that it's REALLY fast

The price benefit isn't really a consideration for me, I still have the server I used to run it on (in fact I don't have a unix machine at home, so I edit the site on my server), but it is nice that it can be hosted on a really good CDN (which a database-driven website couldn't be.)