I would never purchase something where a seller mandated I pay via cashier's check, money order, bank draft, or some other method where I didn't have recourse in case the item arrived broken or not as described (though I am fine paying in cash for in-person transactions where I can inspect and test the product before payment changes hands).
I have also noticed a number of sellers here who do accept PayPal stipulating that the buyer is responsible for covering the PayPal fees. That's explicitly against the PayPal terms of service. Buyers are not allowed to impose surcharges for items that don't apply to all other forms of payment.