Yeah, although in all but one case they've been older consoles that I could get on the cheap.
I bought an Xbox for Jade Empire, ended up getting a decent portion of the back catalogue.
I bought a GameCube for Luigi's Mansion, ended up getting a ton of other stuff for it very quickly thanks to my older brother dumping all his old GameCube games on my lap for my 17th birthday.
I bought a PSP for Dissidia: Final Fantasy, and then realised there's loads of good stuff for the PSP.
I bought a DS purely for the then-new Pokemon Platinum, although I hadn't realised my DS was in a bundle pack, so it came with Professor Layton and the Curious Village, which was awesome.
And finally, when I get a 3DS, it's going to be purely for Kingdom Hearts: Dream Drop Distance, and then I'll see about getting other stuff for it afterwards.