OP, I very much doubt the game designers are going to jump into this thread to explain anything to you. If the current design wrecks your head, maybe this game simply isn't for you.
I applaud your suggestions, save one. I don't think we need to erode subscription perks by giving more of them away to F2P. The F2P system is supposed to be a little unsatisfying in order to push people to buy into the game either through subbing or the cartel market.
I would like to point out that, based on the capitalization, syntax, and structure of your post, you should probably refrain from calling other people stupid.
Please stop confusing "mistakes" with "accidents." "Accident" implies that the action is unintentional, which it is not, buyers have to go through several deliberate steps to locate and purchase an item. What you are describing is a "mistake" -- the player fails to pay attention to the process.
GTN mistakes are pure user error. I should not have to suffer through your inane GTN mechanic because some people can't GTN.
My 2 cents worth is to add that trying to keep up all your gear with commendations is nigh impossible, and you are going to wish you had hung on to those comms when you get to level 60 and can purchase the level 60 basic gear.
Other folks may disagree.
EDIT - I found that reasonably current greens are fine for leveling.
There's a difference between an "accidental" 10M purchase and a "stupid" 10M purchase. "Accidental" would be "I drove by the GTN and it sold me an item that I didn't click on." "Stupid" would be "I ignored all the numbers in the price, and the existing pop-up."
You didn't put slot machine in the title to your thread, so I actually read the OP until I saw "slot machine." Is this bait and switch? Can I have my time back?