Regarding the letter about the ROI-based POY system, the WSOP did actually publish entry lists for all of the events in 2011 and 2012 (they're still there in the Reports tabs).
A couple of enterprising organizations scraped the data from the PDF files and built databases of the info (you can look up Phil Hellmuth's buying for those years here:
http://wsopdb.com/?q=Phil+Hellmuth). Back when QuadJacks was around, they got a little fancier and combined the buy-in data with winnings, and you could look up pretty much anyone.
QuadJacks disappeared not long after, I have no idea who's behind wsopdb but it's still there, and for
some reason, the WSOP stopped publishing the entry lists.
One creative use of the data came from the German site
PokerOlymp, which compiled stats on every player with 50 or more entries over those two years.
Pretty entertaining.