BuddyPress.org

Not sure how difficult it is to code 5 e-mail-fields

Actually very easy especially if you don’t mind all sorts of potential nasties happening, on the other hand look at the testing that went on for this plugin as an example of even with what appears a trivial matter or function just how much in reality needs to be thought about and tested, the work Boone did to get to the stage he has with the plugin cost a lot in terms of time and time translates to an implicit cost that in the case of these developers is seldom recuperated.