I've wondered the same type of thing myself for a long time about different things not just real estate, and found that you could get 100 people and 100 different answers from each, mainly because it's a philosophical question. Everyone has different reasons for doing or not doing something and in my opinion that applies to all industries and all job functions.
It's always a matter of timing in finding a "deal" that's right for you, and this all corrolates directly to luck. I don't mean this from a supersticious standpoint - it's just a matter of putting yourself in situations that will allow you to catch "luck" more often than other people, by researching things on a daily basis and working to be the one to see them first and prepared when one comes along. This way a lot of times before anyone realizes whatever you're working on is a great deal, you already acted on it. Perhaps your broker has a ton of sh!t on his desk and doesn't realize what he's got under his nose.
Whatever the case of why he's not taking it, I know that personally if I felt something was a good deal and had to ask why the broker is not taking it I'd be convinced that I should start acting and right then and there. Especially with real estate, it's not like you're bound to your first instinct, the process allows you to back out in a reasonable amount of time and in the meantime you can see if you're getting yourself into a mess or if you just made a deal that you'll be talking about for a long time.