I would not use my DVC points at Yachtsman. I have been going to Myrtle Beach for the past 20 years. The Marriot Grande Dunes may be the one exception for trades into Myrtle Beach, but that would be a stretch. Fairfield has a nice Resort in North Myrtle Beach also. There are alot of really nice resorts that offer nice on-site amenities. The Yachtsman is a nice building, in a good location, but doesn't have much in the way of amenities.
Depending on the time of year you go, really has an impact on costs of rooms. June, July and August are peak times. May has two bike rallies that I would advise to stay away from (second and fourth week in May). March, April, September, October and first half of November are big golf months.
If you have any specific questions about Myrtle Beach, send me a PM.
What type of accomadations were you looking to use your points for?