This is starting to sound like RGP, if we are discussing the semantics behind "professional" and "world".
Build a bigger place, get more people from across the "world" to show up, and then you can make that claim as well.
A professional competitor, in any sport or contest, is usually denoted by the fact that you can make money doing it. "Making a living" off of it, has nothing to do with being professional. It just states you are the best of the best.
If I'm the 3rd string quarterback for an NFL team for my entire career, I probably made the league minimum. If my career was only 5 years, you'd still call me a professional football player even though I doubt I'd be making a living off it after my career was over.
Last I checked it's only called PAPA HQ, and yes it's only one location. Not sure why you need more than one location to call some place a headquarters, but secondly tournaments all over the world award free PAPA tournament entries to those that win smaller tournaments. Hence, we all come to PAPA HQ to determine the champion. I guess the other argument is the IFPA decides this?