DC points can be resold. They must pass ROFR to transfer. Obviously, you would like the sale of your points to be as high $$$ as possible. So, it's a balance.
- Price too high, sellers will go elsewhere
- Price too low, you'll get less money and Marriott will ROFR sale.
Suggest you contact a respected TUG re-seller (such as Samuel R. at SethNoc's Sellingtimeshares.net) to assist you in brokering your points. You'll spend some money on the broker, but the sale will be faster, more secure and cause you less headache. I believe there is currently a good market for resale points.
A few knowledge points:
DC point resales are currently reselling at just under $5 a point (last I heard). There is a mandatory ROFR, there are mandatory fees for the buyer (junk fees about $2 a point, 3k minimum fee). Thus, the actual cost of resale points is currently about $7 a point (to the buyer). Suggest you push ALL fees possible to the buyer; that way if ROFR'd, you'll avoid paying the fees.
You didn't mention how many points you have, but with the min $3k junk fee, 1500 becomes the minimum cost effect point's sale.
Good luck.