It was 50k doubling each day. So 50k + 100k + 200k for 3 days, if they had let it keep going it would of hurt a lot. This type of fine works.
At 10 days would be 51 million, after 20 would be 52 billion dollars. So, they have a compelling reason to comply with haste.
Add to it the gun law was declared unconstitutional by the fifth circuit Court of appeals recently, it's likely the only charges he'll be facing are tax related. It's funny because the gun charge was the only thing holding back his plea deal.