I think the point of this setup was to get a free solution for those sites that get infrequent hits - that still fit into a git developer's workflow. We all have those sites. I noes! :)
Not to mention, while some have mentioned that you could create a github page, does that mean you'd have to create a separate repo for every page? (Not sure how github pages work at that level). This solution would allow for a single repo that holds all the sites - whereas not polluting your repo space.
I think this solution is for a particular niche of devs who control N number of domains - who want minimal maintenance and most importantly - no cost. ;)