This stuff is completely nuts. You know it's not rigged BECAUSE of the money involved. The incentives just aren't there.
Even taking what Flores has said at face value, just look at what happened. Did he purposely lose for 100k? Hell no. Why would he? He's making millions of dollars because people think he can win football games. What possible motivation could he have to lose them? Certainly not for 100k, it would be irrational to do so even for millions since that's what you are already making legitimately.
If the NFL is involved in sports gambling they have an incentive to make sure it's fair. There business depends upon it.
Creating "professional" refs gives the refs power. It makes it harder to discipline and fire them. It would make it easier for a "pro" to entrench themselves and be corrupt.
Everything about this post is backwards.