What makes Brazilian Jiu-Jitsu different from other martial arts?
You cannot fake being good at BJJ. In striking arts, you can look impressive hitting pads without ever testing yourself. In BJJ, you spar every class against people actively trying to submit you. Your skill is exposed immediately. This honesty attracts people who want real ability, not just the appearance of it. Also, you can spar at full intensity without brain damage since there is no striking.