Self defence?
Nah, you would kill for other reasons if the need arose.
Your intelligent, work out the various reasons.
As for paying, I pay for a gym/dojo so thats possibly correct.
For major events I never pay.
But millions do across the world, how else does HMBO/SKY and other channels exist?
SKY built their coverage in the UK with the first live broadcast of Tyson, bet you watched that somewhere, either live or repeats.
So millions pay to watch this, week in week out. At private bouts and sponsored by multi-national companies.
Argue that one.