a pool operator who can pay directly to paypal for an additional fee (Of say 1-5%) would have a far greater appeal than those which require high income users to deal with one, or more, third parties in order to convert their coins, by which time they have lost more than 10%.
I know you crossed-out the comment above, but it might suggest a minor confusion about CoinCard, so I thought I'd comment anyway. CoinCard's PayPal fees range from 1-3%
depending on the order size. However, you don't pay any PayPal fees to receive these payments, so it's one of the least expensive ways to receive PayPal funds.
There is also one reputable pool operator who's integrating the CoinCard API
into his pool to automate PayPal payments. I don't know if his plans are public, so I won't mention the pool by name.