"The work of unpaid volunteers" does NOT mean it is amateur or unprofessional. It means people are taking time to post about things important to them and they may be professionals in their work hours. I know of groups of librarians and museum staff who have regular Wikipedia posting sessions to address this very issue. If you don't think the posts on Wikipedia are up to your standards, then post them yourself. And you will join the ranks of the passionate amateurs posting at Wikipedia.