No Mythus? 
My collection's far more erratic than that, and mostly out of boxes now (it was easier to move the books loose). It's also been weeded once or twice. But I've still got the original Star Trek RPG, Mythus, original Gamma World, original Twilight 2000 and some stuff like that.
Nope, no Mythus - it never appealed to me for some reason. But take a closer look at the one titled "Mix shelf" and you will see a weird variety.
This is my third set of game books; the first was collected from 78-ish until I went into the Marine Corps in 91, then I collected more for the 6-years I was in the Corps. (Even got a big box of games shipped to me while in Desert Storm - and ran some games while there!) My collection would be about 3 more of the shorter shelving units full if adding all of those, without including duplicates (which I already have, if you noticed).
Yours look nice, suspect like they were all purchased new and mint.. 
Some were, but as I said, this is my third set, so most of the older were bought from used books stores and such. But I do try to get the best condition available, and for those games I really, really like I will have multiple copies: shelf copy and use copy.
Me? I'm too ashamed to photograph mine,
Don't you dare be ashamed of your game collection, no matter the condition. It is a proud hobby, full of nobility, and.....err, well, it fun and nobody gets hurt (if you are doing it right), so no reason to be ashamed.
Last time I counted (circa 2005)... there were about 300 RPG systems...I've never counted all the supplements or magazines. The wargames and figures I keep in a shed though....
I have never counted how many, I am too scared.
