Because the view and feeling of flying a chopper can't be beaten! Though I don't work in the helicopter industry, I do get regular ribbings from my rotary mates about flying planks!
I'll give you two memorable moments to make up for the fact I am a plank driver...
Firstly Intro flying lesson, approaching the R22 hunched over, blades turning, while my mate got out and I got in for a go at the controls... made me feel like I was in a war movie!
Secondly low level checking out elephants in the Kafuwe national park in an E120.