My theory is they will use averages and that it will be on the owner to support they didn't exceed dues if flagged...no idea if this will be true, but I will be surprised if rental contracts will be required. Again, they don't need to go there.
Drawing a conclusion here..... The ball remains fully in their court still . They can say to an owner that the # of reservations in the names of others appears you could be in violation of the commerical purpose clause, and so we enforce the policy unless you can prove to use that these reservations in names other didn't produce a rental income above dues...
The owner would then be forced to provide proof to the satisfaction of DVC that the ones they are claiming are "gifts" for family and friends, and if they can't, then just like the 2008 policy, enforcement can happen....
That is why I personally think this was well done becaue owners can rent up to the cost of dues and even if you look at average cost of dues, and average rental cost, it would work out, at most, for many membersihps to be close to 50% of the points maximum that can be in the names of others...meaning the rest would need to be in reservations in the owners names.
I still believe that the bulk of owners out there renting who are not renting for commericial reasons, do so based on the rules in place and will continue to do so....