>Buying bitcoins with Paypal is a very common request, which most sellers won't do because Paypal makes it very easy to rip off the seller.
Where are you observing that it's a common request? Could it be a common request because it's easy to rip off the seller, in the same way that assistance transferring a dead relative's funds out of Nigeria is a common request?
Go on any Bitcoin forum and the newbie section will be filled with people wanting to buy Bitcoin with credit cards, usually via Paypal. Some of those will be scammers but not all of them.
Where are you observing that it's a common request? Could it be a common request because it's easy to rip off the seller, in the same way that assistance transferring a dead relative's funds out of Nigeria is a common request?