I only buy CE's when they have something of interest to me, or when they are cheap. I am a sucker for those hardcase tin versions though, like Dragon Age. I was more interested in the cloth map though, which I have already framed :P. Would I have bought the CE JUST for the tin? Probably.
BioShock was a given, and is still my favorite CE ever purchased. Things like:
Resistance 2 LE @ $30 new
Lost Planet CE @ $4 - 10% used
Turning Point CE $5 new,
Prey LE $20 new,
Gears 2 CE $30 new
+ a few other cheap CE's I've grabbed, were mostly based on impulse on the price, and way after the games came out originally.
I was seriously hoping for a BioShock II CE Big Sister figurine, and at $99 or whatever they're charging for the CE, would have bought it for said figurine. But with what is included as is right now is a ripoff and of no value to me.
...on the DLC/Exclusive content stuff... this shit needs to stop. Now. I still can't figure out how EB/GS managed to get away with making it sound like their store was the only one getting the cloth maps and tin for dragon age...