I guess no crypto exchange is doing it right now as it would be an extra hassle for them and getting them no special business benefit other than covering traders who have ONLY paypal/skrill/WU options. Fortunately, a trader from any country may start using crypto payment options more easily compared to paypal hence exchanges may not bother paypal based users any more.
@OP
You sound like you are studying features to be implemented for an upcoming exchange. It would be much better if you edit the subject of this discussion to more appropriate manner rather than sounding like "you are looking for active traders for tips".
Right subject-line for this topic could be:
* what are features to be implemented for a better exchange
* Features, you are missing with existing crypto exchanges
* Suggestions are welcome to build a dream exchange