Top 20% paid out 80%. Other 20% is fees and TDs choosing. Smaller value players packs requirements. Less investment for TD with greater return. Mediocrity is not rewarded (paying out to 40%).
Theres also the thought Peter Shrive brought up when running for Board last time. Splitting the PDGA into a For-Profit Pro and a Non-For-Profit Am. Ultimately AMs and Pros (and those aspiring) want different things. Keep the rules and community tied together though. A For-Profit would be able to build a Tour much easier.