Why no communication between Dome and Bravo?

I used weekly buyers of new singles and buy today only now and then a sampler, which I access primarily on Bravo hits or The Dome. Unfortunately, I note in this edition 73 that there were 23 or 24 songs on this collection a few weeks ago on Bravo 88, so that a purchase is just not worth here, especially since a large proportion of "do not duplicate" songs rather the direction Deutschpop / rap are to you, which is not my way. Why is there no communication between the two publishers, why not be the release dates just further apart, so that each of the two samplers can absorb other hits in big parts? Ultimately, this would be not only for the people interesting, still like to collect the latest hits on CD, but did but also the sales well. 3-4 weeks later with a large part of new hits and I had bought 73 Dome, although perhaps 10-12 titles would still have been the same, as soon no longer rotate the singles charts today yes. And then, 7-8 weeks later could come a new Bravo hits again.