I never do too. 1. It smears I have a Mac liner (pencil) and Estee Lauder, waterproof they all smear off before an 8 hour day.
2. It is a hassle to take off at night. You gotta use eye makeup remover, then a qtip inside your bottom lid, and it's a mess that takes too long for me.
For those two primary reasons I dont do it on a daily basis. I like a clean look. But for a party I do go all out, and will get the smokey cat eye look.