I don't see why it wouldn't make sense. As long as it's handled in a careful way. You can pay extra to expedite all kinds of government services, why not SEC investigations?
I suspect it is illegal to accept illegally-obtained money. Therefore, if Mark was found guilty, the staff cannot be paid. Which also gives incentive to not find him guilty, resulting in a conflict of interest. IANAL, though.
It doesn't actually matter if this is true or not; perception is reality.
can't work with SEC, since they have to do interviews etc