Now, chances are you probably own all the classic Fallout titles--when the rights changed hands at the end of 2013, GOG.com ended up giving the first three (Fallout, Fallout 2, and Fallout Tactics) away for free. Still, it's a hell of a collector's item if you're a big Fallout fan, or if you somehow missed out on playing Fallout 3 or Fallout New Vegas.
There's no word on how the games will activate, though I'd assume that like Fallout 4 each title will come with a code to redeem it on Steam. In other words, you're paying for the "It's real and I can touch it" aspect here more than anything else. It even has a slot reserved for your Fallout 4 disc, assuming you're buying a physical copy of that too.
And it's not too bad a price tag, as far as Collector's Editions go--the entire set will retail for $50 when it launches on September 29. Assuming preorders don't gobble up every copy before then, of course.