They implemented it in anticipation of your request, many years ago!
The FAQs state as one CC tournament payout option:
Top 3: 1st Place: 55% of the purse, 2nd Place: 30% of the purse
3rd Place: 15% of the purse
1750 credits would be payed out
962.5 cr to first, -4% of 1,000,
525 cr to second, +5% of 500,
262.5 cr to third, +5% of 250.
Close enough, don't you think?