I am not sure these serve any purpose. The maintainer line duplicates information available from the archweb or aur interfaces and could also be outdated. The contributor lines are mostly redundant with svn or git history, can take up several lines in the PKGBUILD and can become irrelevant after significant refactoring.
What are your thoughts on dropping all these seemingly unnecessary lines from our official PKGBUILDs? Anyone feel strongly about keeping them (and why)?