welcome VM.

let me see if I can answer some of these questions.

Why are there no windows in Kingdom Halls?

Why aren't they allowed to buy Girl Scout cookies?

How often does the Watchtower change the doctrine?
Kingdumb halls are cheaper to build, maintain and heat/cool without windows. They dont want kids (or adults) to look out the windows but to pay attention to the crap going on the stage. That and alot of JWs work as window washers due to a lack of education so I doubt they want any extra work.

Girl scouts are a "worldly" organization so they dont want to contribute. Anything that isnt involved with the JWs is considered wrong. Its all abut isolation from the rest of the world and control over the members. The rules dont have to make sense, most are just to keep members on their toes.

Doctrine changes alot. Whenever they need to change it to deal with legal issues, false prophecies, or as a said before, just to keep control over the members.

Rusty

Boy, when you're dead, they really fix you up. I hope to hell when I do die somebody has sense enough to just dump me in the river or something. Anything except sticking me in a goddam cemetery. People coming and putting a bunch of flowers on your stomach on Sunday, and all that crap. Who wants flowers when you're dead? Nobody. ~J.D. Salinger, The Catcher in the Rye