My 8 year old has his regular chores around the house. If I want him to do something outside of those regular chores then I usually pay him at my discretion. He can spend that money on anything he wants. I believe I'm teaching him the value of money this way. That is just my stance. I can't tell your parents how to raise you so that's a moot point.
So I will just tell you what my parents used to tell me - when you're 18 you can do whatever you want, until then you live by our rules.
If your parents won't let you get it then respect their wishes. If you have to have it, try contributing to the game some other way. Make insim apps, make skins, build websites. You could even join in the voucher competition. There are a lot of generous people here, help them out and maybe, just maybe they will help you out.