You are the only one .... kidding...
Why black...? several reasons;
1 my personal preference, I like..! (Don't like bleu or red or yellow or other Color...)
2 For me, the figure stands out more than a white (for instance...) background; to 'loud'....
3 Guess is a 'figure hobby fotograhper thing'...
But for you; (I'm not that bad
PS or verbal beating and/or abuse there are poeple who pay and get paid for this