"Network or VSN means the Vistana Signature Network, the service name given to the variety of exchange and reservation services and vacation and travel benefits currently offered, and the restrictions currently imposed by Network Operator for Network Resorts. The Network is an exchange program offered by Network Operator, an exchange company. Network Operator means Vistana Signature Network, Inc., a Delaware corporation, its successors and permitted assigns."I would agree, they won't pay an Exchange Company Dues to Abound, but there is this "beyond what is payable to Network Operator for membership in the Network". So I think VSN members still pay the fee, just to VSN instead, as the Network is defined in the document as VSN.
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To me it sounds like you continue to pay the existing fees to Vistana for Vistana (the Network) not for Abound. I do not see any mention that you have to pay additional money for the Exchange (Abound).