I would like to address two points...

Regarding your comments about the secretive nature of many DJ's, I tend to agree with Ben here.  It's human nature to be 'one step ahead'.  I feel that you are being very charitable posting your charts, the fruits of your labour, for all to see.  However, can I assume your charts consist of tunes that you have already aired on radio/in a club?  Perhaps in your case, there is an element of the tunes you are sharing being 'yesterdays news'.
How do you feel about sharing information on the tunes you are after, and as yet, do not possess.  Would you be slightly relucant to part with this 'edge' you have other other DJ's?  
Perhaps this can be compared with the secretive nature, or 'selfishness' of other DJ's...

With reference, to pushing new music, I feel it's not always appropriate, or even possible, for every DJ to do this.
A newbie on the scene, has little influence on what he can successfully show an audience.  Sure, he can play breaking music and impress a handful of people like you and me, but the main body of the crowd, in my opinion, will leave unimpressed, unless he's thrown in a decent helping of crowd pleasers.  
I feel that if DJ Nobody and Roger Sanchez played the same set, to the same crowd, the Sanchez set would be rated much higher by the crowd.  This brings along the point that an audience is perhaps less intelligent than we would like, and can be instructed what to like.  Media demonstrates this, and don't think this point can be overlooked.  
If SAFm played Zamelaya ten times a day maybe Ben would get asked for that, instead of I am The One... mind you he doesn't have it yet;)

Anyway, I could type for hours, 5 minutes of disjointed drivel is better than 4 hours worth...