Uh, what are you all talking about? I just signed up for HBO GO and MAX GO on my computer, and all I've seen available so far are things I've already seen on my TV, but in lower resolution with lower quality sound. I do have an XBOX 360, Ipad, Ipod Touch, but why in the world would I want access to programs I've already seen, with poor picture and sound quality? I'm sure I'm missing the point.
Obviously you're not interested in a lot of stuff others are: the entire back catalogs of every HBO TV show ever (Band of Brothers, The Pacific, Deadwood, Oz, The Sopranos, Six Feet Under . . .) and the entire online catalog of HBO programming for the current month on a big screen (something net yet offered through HBO On Demand, no matter the relative quality).
Not everyone has a DVR or MRV, not everyone wants to fart around through 2 weeks of Guide data for 6 or 8 channels to find out when to set a recording, some people just want to sit down in front of their device (TV, laptop, tablet, phone) and just watch an old movie RIGHT NOW, no fuss, no muss.