Maybe it is just my ADHD but I can't concentrate with any sort of flashing light in the room.
My friend uses his RGB-lit gaming pc for his home theater and he can happily watch movies and TV with 8 RGB fan lights flashing.
It is beyond bizarre to me.
I simply like colourful pretty things like some kind of magpie and also pointless customisation.
I have a bunch of different keys and macros for different games and programs too, and different colour schemes for each let me easily see which profile I've got selected.