You can not deposit PayPal funds directly to Bitcoin Market since PayPal frowns upon alternative currencies. However, you can send and receive PayPal funds with other members by trading BMBTC/PPUSD. Bitcoin Market holds the seller's Bitcoins until the seller has received PayPal funds from the buyer. Then the seller confirms payment and the Bitcoins are dispersed to the buyer's Bitcoin Market account. In short, Bitcoin Market acts like an escrow agent for PayPal payments.
According to this, they still use it as an escrow sort of holding for dealing with paypal trades, unless I am missing something here? (I got that info by clicking on the news "we do not accept paypal deposits"
I am just guessing they don't do direct deposits, and just are a tool for trades now?
They did do escrow holding of the BTC, but not Paypal money, so chargebacks can still easily be done when buying bitcoins. There's too many loopholes in Paypal exchanging. I suggest checking out http://tradehill.com as well --- which seems to be down now. #fail