yea thats worth it, the only thing that might go wrong is the wires inside the cord could have sustained damage and they stop working later, but its just the cord, small amount of money. anyways my friend had a similar deal, his parents did not allow videogame consoles at all, and he hid it and played it when they didnt know, one day they found it and they gave in and let him keep it, probably after some scolding.
if your parents have a problem, explain to them that all your friends are allowed to have them, also that it will improve your eye hand coordination and once you get your license you will be a better driver, you can then go on and on about how games increase your IQ by making you think in new ways to solve problems (called fluid intelligence, as opposed to crystallized intelligence [i did not make that up, look it up if u want]).
good luck