There you go, you just quoted Wes there; cost of doing business thingy. Wes said for 21 years that about the same amount of fines had been levied from theirs/others investigations with highest one $900,000,000 fine. Sounds high but apparently not for the years of gaming the system.
Yes, the fines FINRA levies are often so small it seems likely the perps simply consider them the cost of doing business.