Bookie odds on who will leave the Supreme Court

Some of these numbers are pretty hard for me to believe and indicate a possible profit opportunity. For example, are the odds only 15 to 1 that Stevens will be the next Chief Justice? 17 to 1 for Breyer?

Retirement odds ($1 will get you at 4:30 on 6/29)
William Rehnquist 1.36
Sandra Day O Connor 3.20
John Paul Stevens 5.00
Field (Any Judge Not Listed) 7.00
Ruth Bader Ginsburg 11.00

TO BE NEXT CHIEF JUSTICE OF U.S. SUPREME COURT Time: 03:01

Antonin Scalia 2.10
Clarence Thomas 2.62
Field (Anyone Else Not Listed) 3.50
David Hackett Souter 7.00
Anthony M. Kennedy 9.00
Sandra Day O Connor 11.00
John Paul Stevens 15.00
Stephen G. Breyer 17.00
Ruth Bader Ginsburg 19.00

TO BE APPOINTED NEXT TO THE U.S. SUPREME COURT
Michael J Luttig 6.00
Samuel A Alito Jr 7.00
John Roberts 7.00
Emilio M Garza 7.00
Alberto Gonzalez 8.00
James Harvie Wilkinson III 8.50
Michael McConnell 9.00
Miguel Estrada 11.00
Theodore B Olsen 13.00
William Pryor 15.00
Edith Hollan Jones 17.00
Frank Hoover Easterbrook 21.00