You don't have a problem with money flowing in to and out of your account, so long as it all balances out in the end? Really?
Then you won't mind if I borrow the keys to your account. You'll never notice a thing.
Even if PP is just covering their embarrassment over a mistake, it is still nonsense on stilts that they stonewall and bullshit about transactions flowing through your account. Who knows if they're even legal transactions? Someone could be playing a game.
Before you assert the belief that Paypal would never risk laundering money, you maybe want to look at Wachovia, HSBC and Deutsche. And it doesn't have to be "Paypal" in some formal sense; it could be employees there.
It is incredibly naive to play "what, me worry?" about sketchy things going on in your accounts.