Obviously when your playing out, you want as many new and upfront tunes you can get for the people you know that will be looking forward to hearing new material, but for me (who has little money) a week where I don't recieve any promos, is also unlikely to have bought new tunes and will have to resort to playing older tunes.

But then this is all the politics of DJ'ing, as long as you try your hardest, please the crowd, do your job well, then you have suceeded and you are a DJ.

Things like this only matter to the people who are massively involved in the scene and more in depth topics like this come into play. For the majority of the crowd are people who don't really know what the tunes are etc etc.