Removing a seatpost is so much hastle. Why not just use a cheap seatpost and saddle with a bolt and allen key, then no-one will want to steal it.
Try timimg how long it takes you to secure and refit QR mounted seatpost and wheels. (30secs a lockup). Multiply the number of lockups a year (500), that is 15000 secs (over 4 hours a year).
My non QR seatpost and axle bolts take a bit longer to change, but I get around 2 punctures a year, so apart from maintainance, my streetside wheel removal saves me 2 hours for every puncture. QR or SR. ?