In reply to Drew Jaynes.

Drew, developers in this case was not short form for "plugin developers" but rather "web developers". Who do you think it is out there building all those WordPress sites? It's unlikely that it's end users. As Matt Mullenweg said at WordCamp Europe, only 4% of sites get updates beyond the first two weeks. Logically it follows that the long term and steady users of the plugin directory are indeed web developers, whether agency, client or freelance.