There are other benefits to going in the winter time other than the massive $$$$ savings.
1) Usually less crowded. Basing this on the many reports I've read here where a group or one went to Bandon in the winter and had the course to themselves.
2) You get to see the course in different conditions. Sunny and 60 one day, rainy and 40 the next!
3) No waiting for beers after the round as you get immediate service.
4) Less traffic on the drive down from Portland airport!