I'd say my drive is one third nostalgia, one third loathing of what modern gaming has become and another third of playing various games I never played before but always wanted to as a kid.
I can't really stand a lot of modern games, as not enough of them have settings, design or gameplay I like, are prohibitively expensive, uncompressed and unable to fit in my storage, entirely to focused on graphics often to the detriment of those graphics- I don't care how many shaders you cram on to each individual hair folicle for characters if those characters simply look like the same scifi scavengers or generic military dudes with no unique, interesting or truly eye-catching elements to their design and levels just look generic and boring as hell.
Not to mention often multiplayer driven with no single-player component. If I'm I have to pay upwards of $60 for something it had better be a full package instead of an exclusively MP thing with no single-player campaign for instance, otherwise I'm not gonna shell out the cash. Especially when that cash is padding the massive, echoing vault chambers the corrupt and megalomaniacal uber-rich like to swim around in Scrooge McDuck-style while the entire fucking planet burns down around them.
So, I'd rather go back to an era when I actually had hope for the future being anything other than a cyber/biopunk dystopia ran by pederasts. Thus, I play a lot of the games I enjoyed as a kid, as well as trying out the ones I always wanted to but never got the chance to or playing the same games nodded to be even better, like Halo Havoc, Super Mario SunBurn or RealRTCW.