The threat level has been raised on our collective wallets. You can now use PayPal to fatten your PSN Wallet. Unfortunately--and as expected--it's simple to use. You (1) during checkout select Add Funds, (2) select the PayPal option, (3) select the amount of funds to add, and (4) select Continue to drain your wallet.
You still have the option of adding funds using a credit card or a PSN card, but if you've just got a big bagful of cash sitting in your PayPal account: BOOM. Now you have slightly smaller bagful of cash on PayPal, and a slightly fatter wallet on PSN.