Why do some mixes have cutoffs at 15/16k hz?

I work in (reggae/Jamaican) music and notice this 15/16k cutoff in many of the masters when I look at the MP3s or Wavs. Is there a specific reason or tone achieved when this is being done to the masters? I know most of those frequencies up there are airy and some songs and plug-ins allow for up to 40k in EQ modifications. I was just curious if there was someone in here who might have the answer! Thank you!