Now that my helmet is a few years old, I don't mind leaving it sitting on top of a mirror for a short stop, depending on where I am, even though to replace it with the SENA intercom mounted on it would set me back almost $1000. We are fortunate to live in a low crime area. Helmet locks just typically don't work well particularly with full face helmets.
2004 Rebel 250, 2003 BMW K1200GT (roadburner), 2004 BMW R1200GS(all purpose),
1996 Ducati 900SS CR (California Bike), 1973 Norton Interstate (in a box in the basement)