What the hell are they planning to gain from this?

People that are suspicious of him are not going to have that doubt removed even if he wins in court.
So his public image isn't repaired

The court preperations and case make it impossible for the fight to still happen.
He is going to miss the opportunity of a lifetime payday

It looks like the max money he can make in court $75,000 per head at five people is what? $375K plus court fees.
What's $40 million - $500k = how much money he lost doing this.

It gives the sport of boxing a black eye
Yes all those casual fans and boxing haters can say "Yeah in boxing they don't even fight in the ring anymore, they fight in court."