Promo Only makes up a good chuck of my mobile dj library, I have 2 sets of the radio essentials 1 -60 cds and I have a full set of there Hits radio 1 -115.
Plus I get 9 of there monthly sets, So I have just over 1800 cds of there's now. What I like they are clean edits. I do lots of all ages shows and school dances so I need clean edits.
My "Radio Essentials 1-60 is my go to set for weddings. close to 75% of what is requested at weddings comes out of that set.
I do have two full cases of other cds I take with me to shows I do, best of, special stuff, beatles, abba, stones that sort of stuff.
But for when I am in the club I can get away with a bit more, I can play some NIN, and tool and such but I still get the odd finger wag from the owner.
I do not get that many gigs in the hard core metal / rap bars down town so I do not really see a need to spend money on cds I will never play.