I stopped taking paypal LONG LONG LONG ago due to 3 things:
1. Unless you pay via "gift", which is circumventing PayPal TOS, last I looked it is a TOS violation to charge a customer for the 2.9% or whatever it is these days service charge for the transaction. This has been hashed over and over and over. I view the service charge as part of doing business, but I also view it as an unnecessary inconvenience too.
2. PayPal seems to pick and choose if they are going to cover claims on live animals, and again IIRC their TOS does say they do not.
3. If memory serves me right, I've had a PayPal account since 2003 or 2004. On multiple occasions I've had attempts to access my account after notifying an individual that I've shipped. I use to leave funds in my PayPal until the animal(s) arrived safe and sound, in case I had to refund due to death, etc. Because of this, and to avoid getting scammed, have my account info leaked/hacked, etc. I've pretty much stopped using it.
I have an old school thought on this matter. Postal and Bank money orders are easily covered should anything go wrong. My bank treats MOs as checks, which can easily be canceled or fought. Last time I used one, Postal MOs are covered up to $1000, so if you get screwed you're covered. Plus what Rich pointed out...mail fraud.
I view the purchase of any animal and any incurred expenses (most bank MOs are free, Postal you pay for, and the cost of shipping [both MO and shipping to receive the animal]) the responsibility of the purchaser, unless the seller states free shipping or factors shipping into the cost of the animal.
Example: I've been doing payment plans with Steve Roylance. Because I'd rather not screw him out of 3% each payment and because I personally view the cost of an MO and shipping it out my responsibility I've done just that. With my bank, MOs are free unless I need 3 or more at 1 time. I've then probably spent about $35-45 bucks in sending MOs via USPS priority. I feel this process is more secure, though time consuming, than logging into an assumed secure site with my banking details, etc available. The MO can be tracked and I still have a verifiable transaction log if someone tries to screw me.