I have been pondering a thought for some time today, so I thought I would share it with you: Why are people doing this?
Perhaps it is need. Some may find that their objective is the earnings of winning. Maybe they want an iPod or an LCD, maybe they want cash. But these kinds of players, I think, would not be playing this game so hard. If they really wanted these things, wouldn't they have a better way of getting them? This competition seems too hard for this kind of person. I don't think these people will win...
Or another reason - the user is an SEO. They virtually live for this, and they are wanting to prove to the SEO community how skilled they are. I would think this group would account for most of the competitors, although I am not sure.
There are always the curious, but these can be discounted. I don't see how one of these could win; is their will strong enough?
As for me, I'm in this just for the thrill. Though there be the obvious incentives, there is really only one thing for me to gain: pride. And I'm not about to humble myself. :P