Aus dem kurzen Kontext kommt es mir vor wie ein Buchmacher - jemand der die Gewinnquoten festlegt.

Edit:
http://www.thefreedictionary.com/oddsmaker
oddsmaker:
One who calculates and sets betting odds based on the prediction of the result of a contest such as a horserace or an election.

http://entertainment.howstuffworks.com/sports...

Hier wird ganz gut erklärt, was ein oddsmaker tut (und warum und wie)

"ODDSMAKER VS. BOOKIE
What's the difference between an oddsmaker and a bookie? A bookie's job is purely mechanical. He gets the line from Vegas or another source, offers bets at those odds, then collects money from the losers, pays out to the winners and keeps the vig. Oddsmakers don't actually take bets -- they study the games and set the lines. Bookies often adjust the spreads for their games, so they do a little oddsmaking, and oddsmakers work for casinos, which operate sports books that take bets."

oddsmaker seems to be American English

Nicht ganz. Oddsmaker und bookie (Buchmacher) haben verschiedene Aufgaben (siehe oben)

Ich habe in einer Publikation aus der Schweiz
Quotenmacher gefunden

vgl.
http://www.tagesanzeiger.ch/leben/gesellschaf...