Companies like KDAB and Intevation (Kolab Konsortium) and their partners have been working commercially on and around KDE for a number of years now. What started out small has grown into a series of much larger projects and led to ongoing, long term involvement of the companies providing these services (and their customers) with the KDE project. This presentation will explain some of the background of why folks like paying for Free Software work, how one goes about selling it, and buying it, particularly in large organizations and the public sector, the kind of work we are asked to do and how it all works in practise. It will also explore the multiple benefits of working closely with and within KDE, for us and our customers, but also point out some points of friction between those working on KDE as their job, with deadlines, customer priorities and limited budgets, and those who, very rightfully, could not care less about any of those things.