The fact that your local store has them in direct sunlight is probably due to the fact that: A) He sells a lot of cigars so they won't be in the sun for long or B) They are in boxes as well so the sunlight exposure is limited. I think if you plan on aging cigars and they are in direct sunlight you are asking for some bleaching of your stogies. Also the higher heat of being in direct sunlight would evaporate more moisture.
I bought a Glass top humidor and after having it for a little while I sold it to a friend for a fraction of the cost that I paid, just so I could get a solid top humidor. I did it for a couple reasons, to keep the sun out and the moisture in. I feel if it is one of the cheapy humidors that everyone gets then the chances of it having a perfect seal are probably a little less then the solid top humidors. Also there is more cedar in the solid tops wich is good for keeping your humidity in and flavoring your cigars. Also unless you have a top tray full of expensive stogies it doesn't look that good either. And even if you have a top tray full of nice stuff then you have all your friends poking around looking at them. Closed top gives it the out of sight out of mind feel
"smoking is one of the greatest and cheapest enjoyments in life,
and if you decide in advance not to smoke, I can only feel sorry for you."-Sigmund Freud
"The problem with the world is that we draw the circle of our family too small" - Mother Teresa
“The basic difference between an ordinary man and a warrior is that a warrior takes everything as a challenge while an ordinary man takes everything either as a blessing or a curse” – Carlos Casteneda
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