I think the best part of being a robber would be getting to wear a fun disguise or costume. If it were up to me, I'd probably dress up like a dinosaur. You know, something cool like a Velociraptor – not a T-Rex where I couldn't use my hands.
I'd choose a dinosaur because:
A) Let's be honest, dinosaurs are a bad ass.
B) Dinosaurs are terrifying.
C) The crime victims wouldn't be too upset because at least they would be able to tell their friends they got robbed by a dinosaur. That would be pretty awesome.