I disagree with the other guys...the Dr. and PR manager aren't worth it imo. for a DV team, you don't have players that can't easily be replaced for 2 weeks...Even your star could probably be replaced with the money you're saving...
Regarding the PR-Manager, I don't know the specifics about how much a PR guy helps, but I'd imagine he doesn't help that much...I have a level 3 one and I seem to be selling more seats than you... really your call on this one though...