"or is it OK to share my own pattern if someone can't find a reasonably priced copy"
I noticed the OP said "share their pattern", not share a COPY of their pattern. In other words, could they simply hand their original pattern to others in the group to work with.............not a copy? A lot of plans, like house plans, are for building only one house and is usually stated on the plans. Do quilt patterns ever state that they are only for making one quilt?
Jim