If you conduct a random study of men, very few know that much about plumbing. But if I advertise for someone to fix my broken shower I expect the person who shows up to be skilled, experienced and have the right tools for the job.
Likewise if a hotwife advertises for a professional young black bull with a big cock I expect the guy who turns up is skilled, experienced and has the right tools for the job.
Sorry, I'm sure there are genuine cases but when I see videos on here of a woman in her 40s, 50s or 60s, wrinkly, saggy and flabby with a young, virile, muscular black guy with a huge cock, I can't help but think that money must have changed hands.