I do it too, for a couple of reasons.  If I dont have the time to finish a real nice smoke, I'm not going to light it up.  I will take a lesser instead.  Especially if the "good" smoke is one I have not tried yet.
I also do it when my "better" smokes need more time in the humi.  Also to make some more room,  I am in the need of another Tupperdore as we speak.