My house may not be the best option to test your theory. I live at the end of a long cul-de-sac... Anyone coming up my street has business there. Any irregular traffic is easily noticed.
As for the bike, she's safely tucked away in the garage w/o a door leading outside. Also, my bedroom is on top of the garage. There's no way of opening the door without me hearing it. Also, No key, so no way to leave it in the bike.
All that being said, I'm sure if someone wanted it bad enough to break into the house, find the key remote, then break into the garage... If I'm not home, chances are not much else will stop them. If I am, Mr. 870 Express might have something to say...