DRI has two points based systems. One is a trust based ownership. As I understand it, you own a share in all the units involved with that particular trust. Thus, if you own in one of the DRI trust's your MF's are the average of all the units the trust holds. I believe there are additional trust management/admin fee's added on top of the MF.
There is also THE Club, which is a points based reservation system for deeded week owners. With THE Club, you still own your deeded week and pay MF's on your deeded week as calculated by your resort BOD/HOA. There is also an additional fee to belong to THE Club. A gold II membership is included in THE Club's fee.
There are also DRI owners that own deeded weeks but are not members of a DRI trust or THE Club. Those owners must pay for their own II or RCI membership (assuming they want one) and will exchange their weeks based on the rules of RCI and II for exchanging.
Each persons individual needs will dictate which system works best for them. Some are happy using their owned weeks for personal usage or, exchanging those weeks through RCI or II. Others prefer the 13 month internal exchange advantage and averaged MF's of one of the DRI trusts. Others will prefer to keep their deeds but belong to THE Club so they can exchange using points or have internal exchange privledges (10 month window) within the 110 DRI managed and affiliate resorts. Internal exchanges for Trust and THE Club members is without an additional charge at this time. Applicable II exchange fee's apply to both Trust and THE Club members when trading through II.