Ludwig's question interests me.
I was pipe dreaming the other day. "Balloons! Yes, I'll get a balloon license!" (I probably won't - well, not for awhile). In one of the more informative sites they said that 70% of the balloons in the UK are sponsored. Now, with your ship paid for, that's most definitely a damn good consideration. Are they all CPLs?
I'm just curious - I'm not about to go 'playing' at being a pro, or bending rules that will snap back. I just find the fuzzy edges of the law very interesting.