For pro-gaming to succeed, we need a few basic things:

1. GTV
2. Demo's
3. Leagues/Ladders/Tournaments
4. Ease of use
5. Commentary

Show me a single pro-sport that does not have commentary. Why is it then, there is no commentary in demo's or GTV?

You could suggest we don't need demo's or GTV, but if you compare the cost and quality of those with the cost and quality of streaming-video or standard television broadcasting, any business person in the world (and any fan), would choose GTV and demo's. Every penny saved with GTV and demo's is a penny to be invested elsewhere. That includes player salaries, game development and marketing.

One of the greatest advantages to leagues/ladders/andsuch, is that they allow the game to develop a following. It is also helpful when the entire professional aspect is not condensed into a single weekend, wherein people must set aside an entire weekend of their lives to watch a sporting engagement. Most people don't have the time, and if they do, they don't want to spend it with sports. People have time at night, after they're done with work or school, and on the weekends... but with the weekends, they might prefer doing something else, being that they have enough extra time. On the weekdays, they can't really go out and party, because they have to work the next day. For these reasons, weeknights and Sunday are the ideal times for sports. Certainly, holding the typical tournaments we're accustomed to on weeknights or Sundays is not going to be especially functional.

Quake Live has any number of good qualities. But, without the above mentioned, it has no chance of becoming what we need.