Last time I checked. Netsol offered the only payment method to sellers - a check in USD and they'd mail the check only to whois address/name obtained at the moment of registrar transfer. So, if a seller is located outside U.S. - they still have to wait for a paper check even if there is no way for a seller to deposit this foreign check. If the seller is using some sort of whois privacy for a domain sold - the seller should change whois revealing his physical address to the whole world in order to be paid.
Finally, even though Netsol requires registrar transfer-in to them, they promptly accept offers, authorize $$$ at buyers credit card, and forward offers to domains which are not yet 60 days old and, as such, (by default) cannot be sold through their service. Naturally, the seller cannot accept such an offer regardless of $$$ amount - the domain name cannot be delivered as required - but Netsol still receives their commission from the buyer "for trying". A good way to make money...