So then it would seem that it's a time issue, that after several years it may begin to meld slightly? If there are oils floating around in the humidor like a mist it would seem inevitable that they meld to some degree. And if the oils are floating around on the gasses I'd suspect that even separate trays wouldn't be enough, though much better, to stave off this melding.
At this stage I'm uncertain if/when I'd get to the point of having sticks for several years, and if I did they'd likely be the nicer ones.
As it seems just about everyone here has eventually run out of the room they felt they needed multiple times and have purchased additional humidors, and I shouldn't be any different. That being the case I can easily keep longer term and nicer sticks separated... Funny as I was just looking over humidors between 100-200 count thinking that ought to be plenty of storage with my tupperdore as backup.
As my go to homebrew store has been out of various British ingredients keeping me from making an ESB I may very well end up with a humidor soon enough (it's been 3 months now). I've mostly been looking over CI and wonder about the quality of their glass top humidors. Is $1/stick storage a fair enough indicator of quality, ie a 100 ct box for $100? I don't care much about fancy, but do want something nice enough to set on the desk.