Actually, there were loads of Gravatar mods for vBulletin, coded by volunteers, but they got deleted when the new owners decided that WordPress was a threat to their business model.

With vBulletin, you've got to remember, all the original devs have left - Scott McVicar, now Facebook's Open Source Developer Advocate, tweeted "So sad to see the company I helped build up screw customers over. Glad I bailed when I did" - so, the team that made the software great has been disbanded, their amazing plans completely flushed by the company, all that remains are a bunch of clueless but greedy executives who don't understand software, don't see the value in being interoperable with other services and only care about milking their remaining customers for every dollar they can.

It is a shame that WPTavern is not built around BuddyPress because, with vB, you've climbed into bed with some of the seediest guys imaginable. For anyone else trying to decide whether to take the open or the proprietary path for their website, check out The vB Truth website or this article about vBulletin at The Register.