I'll buy Limited/Special/Collector's Editions of games that I am hyped up for enough. Just this year I purchased Bravely Default Collector's Edition ($60), Tales of Symphonia Chronicles Collector's Edition ($110), Dark Souls II Collector's Edition ($120), Final Fantasy X/X-2 HD Collector's Edition ($100) and I also have Drakengard 3 Collector's Edition pre-ordered.
I also bought Tales of Xillia Collector's Edition since it was still for sale on Bandai Namco's site. I had originally purchased the Limited Edition when the game released, not knowing the CE existed. So I was happy to go back and purchase it since I missed out on it before.