tradesports remaining players

[meow_meow]

Ok, tradesports started offering contracts on a field of 100 players, with the highest finisher in the group cashing out at 100, everyone else cahsing out at zero.

Of those initial 100 players, 6 remain:
Raymer 1064k
Ivy 722k
Lederer 496k
Juanda 354k
Beevers 173k
Boyd 72k

What would be a reasonable price for these contracts before the start of play today?
I guess simplest would be to add the players totals and determine their individual equities, which gives you prices of 37, 25, 17, 12, 6 and 3 respectively, but I'm not sure that's accuruate - even assuming they are equally skilled...

Thoughts?