how hard would it be to control? its already set up to be controlled. league policy is already established that prevents the officials from ever speaking to the media. you heavily fine every nba person who ever complains publicly about officials. you pay everyone money than they cannot make anywhere else AND the players money is guaranteed.
huge amounts of money is the very same reason the wrestlers in the wwf line up every week for a paycheck even though they know the sport is fake. they know it is just entertainment. seriously, where are some of these nba players going to go to make 6 million a year? you can put up with a lot a crap for $6 million a year. and no matter how you slice it, the nba, and all other sports, are simply entertainment.
for the officials it is very easy to cover it all up. you only need a few officials to pull it off, not all of them. once you get them in the corrupt group, they have no choice but to comply. if they blow the whistle on the nba, their life is ruined. first, you may never prove it and you become a joke. second, you do prove it and you are implicated in a huge crime ring cover up that will change the sports landscape forever and possibly get you jailed or killed.
lastly, what does anyone know about the hiring process? if you wanted to hire guys who would be willing to be corrupt, you will find them. we give a lot of credit to these guys being honest simply because they have been placed in a position of trust. if they were placed there specifically because they were not trustworthy, how would we know? some of these men may have been very bad men or underhanded businessmen before they became nba officials. we will never know.
this type of conspiracy / cover up is much easier than anyone thinks. it happens every day in big business. we just don't want to think it happens in something we are emotionally attached to.