Poor usability definitely drives people away.  Life is too short for difficult web sites. Users have been burned enough in the past by bad sites, so most of them have concluded that if a site is too difficult on the first few pages, then it will probably not be worth an extended stay.  So they leave.  Leaving is the one thing that’s easy on the Web.     - Jakob Nielson, interview, Database Management, Riccardi, p. 31.