I'm guessing they go to the SEC because they keep getting drafted and paid in the NFL. The SEC has the most receivers on NFL active rosters (as well as some of the best in the league; Julio, AJ Green, Beckham, Mike Evans), over double what the Big12 has in the league (and TTU accounts for 7 of the 14 from the Big12). Georgia is tied for 3rd in most active receivers in the NFL, only TTU and Clemson have more. NFL likes their size, athleticism, the fact that they played in pro-style offenses (learned to block too), and have tape against some of the best defenses in the country. Probably not hard to recruit these kids when you can point to how many are already in the league, as well as some of the highest paid receivers. I knew the SEC has produced some of the better receivers, but did not expect the conference to have the most in the league. That was an interesting find, and supports my theory above about how everyone underestimates SEC passing attacks.
https://herosports.com/college-football/wr-u-schools-most-receivers-week-1-nfl-rosters-ahah