I almost did it. I wanted to buy an alt (this one, so I could re-register for the forums) and had no way to purchase online (no PayPal or gift cards), and wasn't about to ask my parents for a new key (they'd ask why). The only thing stopping me was that I didn't know where my dad kept the stamps.
Eventually, I ended asking my dad to get me this providing that I paid for it by saying that I wanted an independent account from my brother. It took months of him procrastinating though.