All do.
By pro I guess you mean MLS which is the first tier of American soccer, in that case it's 15 teams.
Chelsea
By bus.
As for pro league and older persons soccer, the players will usually just wander around the field after the game and give handshakes and high fives. also in youth soccer both teams line up and give away patches. But usually travel teams do that.
professional soccer is teams that have the best players in the country or maybe even the world. you can become a pro soccer player if a scout thinks you're the best at playing soccer.
All depends on the club they support.
Some acronyms for U.S. Pro Soccer would include the USSF which stands for the United States Soccer Federation and there are also three professional soccer league divisions under the United States Soccer Federation. Division I, the strongest and highest division, is made up of teams from MLS or Major League Soccer. Division II is made up of teams from the NASL or the North American Soccer League. Division III, the weakest and lowest division, is made up of teams from the USL Pro, or United Soccer Leagues Professional Division.
One can become a pro in soccer by joining a team around the area of residence. Then do a lot of practice.
soccer is the sports that has most pro leagues. It even has a World cup.
MILLIONS
40 to 30 million pro soccer players
the benefits are you get a lot of money travel the country and fans.