You are right there a ref could easily throw a flag or 2 to cover a 21 point dog, people would not think to much about it, if you won by just 14, you might be on to something, you would not have to do it but 2 or 3 times a year, nobody would catch on if you didn't do it week after week.It would be easier to buy a referee.
It might have been possible that Florida was trying to throw the game this year. But we showed them.
harder to shave points off a football game by going to the players. Much easier to get in the pocket of an official to ensure every opportunity for a team to win the game. Flag here or there, bad spot, blown review of someone out of bounds, ect ect.
Besides, players are paid to come in and win in College, not lose. You don't pay a recruit to come suck unless you're Vandy.