[Silhouette]

Does an average web app really get 20% of visitors signing up, or are we talking about a subset here, such as web apps running a freemium model? If any of the (commercial) web apps I've worked on could get 20% of visitors to actively start a sign-up process and 80% of those to complete it, everyone involved would have been celebrating for weeks.

I'd guess most of the apps I'm familiar with are around an order of magnitude lower, but none of them currently uses a freemium model. Some are considering shifting to one, and if it really does get this dramatic a bump in initial sign-ups in a typical case then that would be a good argument for doing it.