Rifleman:
When a person signs up with PayPal, you either have to give them a bank account # or a Credit Card #. They will ask for a billing address, then they will verify that the account has that address listed as the address on the account (while it isn't required for you to give it to them), it is a way for the seller to know that PayPal has verified that the address of the buyer. When I am selling something to someone, I will not accept a payment from someone that doesn't have a confirmed address (that is the only addy that I would send the merchandise to) if they want to pay via PayPal. A Postal Money Order/Cashiers Check is different. But, I wait until the check clears the bank before I ship. As a seller, if I accept a payment from a PayPal account, and shihp to an unconfirmed address, then the transaction isn't covered by PayPal's "insurance".
I have my PayPal account linked to a bank account - and I don't keep more than $50.00 in the account other than when I know that I'm using PayPal to make a purchase. That way if a hacker does get the account #, then I'm only trying to recoup $50.oo rather than a much larger sum. I also dont' keep much of a balance in my PayPal account. If someone pays me via PayPal, I electronically transfer the $ to my bank account, then after it's deposited there, I move it to another account electronically. With my schedule during the week, it's easier for me to do it that way rather than have to run to the back and deal with paper checks/money orders.
A friend of mine does quite a bit on E-bay/PayPal and he won't accept a payment from PayPal that is linked to a Credit Card unless it is shipped to a confirmed address. A friend of his got burned by shipping to an unconfirmed address (the account was paid via a stolen credit card which was used to open a PayPal account). He was out the merchandise, and PayPal went and withdrew the funds from his bank account to cover the fraudlent transaction to pay back the credit card company. That was roughly 4 years ago and I don't know if it was ever resolved. So he's out the merchandise AND the $$ to cover the transaction!