Yes, when, many years ago, carbon was the shizznit, they made a few frames (I did not follow it closely) and one of my friends who owned a shop had one. I probably rode it for about 30 minutes and enjoyed it. The price on it was hefty.

He snapped it less than a week later. He then went back to his old frame which he had already owned for over a year.

Carbon is simply not able to withstand the forces that are put on it by bmx riders which are incredibly brutal to bikes as far as my experience can tell. Perhaps current advancements may allow it, but very few riders are willing to risk $1,000+ on a frame with ZERO guarantee and a very high chance of failure. If perhaps, someone made the frame, put Dave Mirra on it for a year, and the frame was proven to be strong - that is, they documented him on the same frame for six months, then perhaps carbon would gain one iota of respect in the BMX world, but right now, there is zero respect for it as a suitable material for bikes. Some minor components use a little of it, but that is all.