Reason I don't is because I honestly don't trust ANY online sights to hold information on me. Be it paypal, Amazon, that store I bought my last anime body pillow, I never save CC#'s or banking info. Yes they have 256bit encryptions for most and SSL, but I just don't leave it up to chance despite my complex passwords (Paypal hasn't exactly had a clean history with accounts being secure...).
Yeah I can't see anyone doing that... what kid saves up for a house