As second effect we expect to motivate FLOSS users to file their feature requests on the platform so developers get to know what people want. It's sort of addressing end user wishes with lot of demand (And yes, this concept is copied from Dell Ideastorm and Ubuntu Brainstorm - but now made available for all open source projects) Of course we are aware that there are roadmaps with future functionality enhancements. In this case it's even easier for developers to participate in the competition: Just file the features you've planned to implement anyway and maybe win a trip to Switzerland and some pocket money.
A last comment by the (unpaid) organizers: The first Hackontest is a trial - if many people participate in the selection process, file feature requests and rate them, if many skilled developers agree to implement features and show up at the event and if FLOSS communities support Hackontest overall (e.g. such as phpMyAdmin), then it's a success (and will be hopefully repeated next year). If not, we're sorry for the distortion we've created and won't bother you again with silly ideas
Thanks for helping to make more marketing for great FLOSS products and participating on www.hackontest.org!