I'm not really familiar with those details, but I know @iacas is, he has been doing course ratings for a number of years. I do know that ratings are done following USGA procedures, but that the teams are organized and assigned by the State or Regional Golf Associations. I'm not sure if Argentina has subdivided into smaller groups like we have, for you it might be the national association that does it all.
I voted "yes" with the understanding that no organization is perfect. Sure, courses need to be set up to allow for maximum roll out in the fairway and some speedy greens to make it entertaining to the casual golf watcher. The PGA Tour is in business for itself but their tournaments do raise good amounts of money for charities. I watch some of most PGA Tour tournaments and do enjoy them and agree that they do help the business of golf. Although they are often involved in controversy I do look to the USGA to maintain the integrity of the game and sponsor the US Open championships.
Maybe. Or roll your PW back a little and play fewer wedges.
To your latter question, it depends on whether you want an extra club somewhere else. For instance, if you can hit little controlled shots with your PW, then you could get an extra club club at the top end of your bag, like a driving iron or hybrid or fairway wood. At your speed, having an extra "big" club like a driving iron/hybrid or something might be good for you. It really depends on what kind of shots you're more likely to face and whether you'll use the clubs.
Some guys don't even carry but 3 wedges: 48, 54, 60, for example. That 6 degrees of separation helps cover a wide variety of wedge distances while freeing up room at the top for other things.