Professional gambler's view on Donaghy

A great piece on Truehoop today, interviewing a professional gambler about the likelihood that Donaghy was fixing games.

Reading this, a few things struck me. Firstly, "Voulgaris estimates there may be as few as four or five whose main source of income is betting on the NBA." Wow. What does this tell us? Is betting on the NBA that hard to get right? Are there that few a number of people that think they can successfully gamble and make a profit on NBA gambling OR are there actually hundreds more who try and fail, making significant losses every year?

Secondly, does this guy not have one of the best "jobs" in the world? I would absolutely love to earn my primary source of income through NBA betting, but a small amount of experience in the field tells me that it's not a very easy route to take.

Lastly, if he has that extensive a database on games and has that refined a system of predicting match outcomes, there should be no way that NBA GMs are not knocking on his door to hire him to their scouting staff. A guy who can predict NBA results can give the edge to a coaching staff on what they need to change to in fact them the favourite... well, it seems to me anyway.