I'm a teenager, and so far I've triple boxed my team to the mid-30s as well as two other teams. I'm in love with multiboxing and since doing this no other gaming experience seems fun anymore. I need some way to multibox!! But I realize I have to stop since these accounts are not on my name (my friends who were using them stopped playing and still had a few months left over) and it's best not to risk getting those accounts banned. So I have a few quick questions on what I need to get two more accounts.

1) Do I need to buy two more copies of vanilla wow, or is there some way to create a new account without buying the actual WoW box? I'm planning on using only one install, that is what I was doing previously. I don't have enough hard disk space to copy and paste the wow folder 3 times, and i see no reason to either since I use the same settings on all the wow windows.
2) I'm guessing I need to buy two more copies of burning crusade? Ouch. Is there any easier way to upgrade other than walking to the store and spending all my money and looking ridiculous carrying identical game boxes? and then having to conceal them from my parents?
3) Can trial accounts be upgraded to normal accounts?
4) Any tricks to know about scroll of resurrection/invite-a-friend that pertain to multiboxing?
5) Is it okay to have 3 accounts under the same name being paid by 3 different credit cards?
6) There's no way to change the name which the account is under?

The main problem here is my age, my parents would kill me if they found out I was spending my money on stuff like this, so I decided i would level each of the characters individually to around level 60 (I'm even planning getting a summer job just to finance this O.o Then I would activate the 3 accounts simultaneously by finding various friends with different credit cards for a month or two of glory). Now, I know you will probably tell me to wait until I'm an adult, but who knows, by then WoW may be a terrible game after the expansion and maybe all my friends will quit playing. I realize multiboxing is an expensive and impractical hobby but I can't think of anything but playing only one character or playing other games is outstandingly depressing or poses no challenge at all. I'm pretty good with computers, so the problem is being able to do this without my parents finding out >< Any ideas? Any other teenagers in the same situation? Thanks for taking your time to read this.