Well, I saw this post few days back - but have been a little busy since then. But wanted to add my little point of view to this thread as well.
I have now been doing photography as full time for few months, so my experiences might not be too broad and doing it here in FInland. The scene might be very different, but here's an idea what I think of shooting as a 'pro'.
In my opinion one of the most important things when covering sport is that you 'KNOW THE SPORT'. You will have a much higher chance of being able to get decent shots if you know the sport you are photographing. I mean, if you have never seen a game of football (that's soccer) in your life. You might struggle to get nice shots from the game.
Knowing the game, the team and players will help you anticipate the events on the field better.
You know which players are likely to go for big tackles.. big hits or what ever it is that happens in your chosen sport.
It also helps to know the arena/rink where you shoot, that way you don't have to rush there hours in advance to check the lighting or which way the sun shines or how the shadow from the terrace moves during the game. Because you already know all this.
I suppose in Finland the rules and regulations on where you can shoot are bit more relaxed than in the U.S or U.K. In here the comments I have received many times when asking where I am allowed to shoot is, ' well, just don't go to the pitch...'
One issue that for me is one that causes 'head aches' is, is there WIFI at the arena that i can tap into. Or do I need to use my 3G internet. As I usually have a deadline to deliver the pictures no later than 15-30 minutes after the game.
So to get the pics from the CF card to the Mac and quick edit and sending 4-6 pictures per paper... I am sometimes cutting it very close ..
But, all in all I think shooting sports is MUCH less stressful than my previous work as a Chef.
Just few views from someone who has just started to make money out of this...