(Image credit: Valve software) Earlier this week Gabe Newell made a surprise appearance in an ad for Oceanco, the company he liked so much that last year he just straight-up bought them. Oceanco is, of course, behind the construction of the Valve co-founder's $500 million custom superyacht , Leviathan, and it looks like this is PR week for the company: it's just dropped a whole bunch of new photographs of the boat for our peasant eyes to gaze longingly upon. As PCG's Andy Chalk adroitly noted of the video ad, "it sure looks like being a super-rich guy is a pretty good time", and these photos do little to dispel that.…