I would rather use a checkbook because you can see where your exact funds are going, if you can't see where your funds are going then your going to be all messed up if someone steals your checkbook and banking information.
Nothing else is going on, I'd rather be safe than sorry, and paypal saying oops somebody hacked into your account and we can't recover it or your funds then your screwed. So please quit raising suspicion that i'm doing something illegal or something because i'm not at all. Being truthful and trustworthy is the best route to go with any information.