i know someone who never does because his brother died and he's sure he would have lived if he wouldn't have had it on.
i do though because i'm always smokin and drivin and i can't risk gettin pulled over. also my truck beeps like a bitch til i put it on
also, my cousin flew out the window and died. RIP
also, i think sometimes it's harder to get insurance to pay if you didn't have on your seatbelt