Predictit.org should score players and give folks the option to contact high scoring players (if the players allow it).
Players should have the option to keep their score anonymous or public and to keep their communications anonymous or public.
A score might be determined by looking at the last 20 bets made and looking at return if they were all of the same amount. This woul prevent the possibility a score was obtained by merely being lucky in 1-2 bets.
Eventually, prediction markets should become highly capitalized markets and these high scoring players may become the future market analysts, market makers and fund managers. I can imagine a future mutual fund being driven/managed by a prediction market.