Just out of curiosity....and I'm asking this sincerely, not sarcastically, because I don't know.....considering a convolution reverb doesn't create sounds, it only plays the impulses you put into it, why would someone pay for one when you can have something like this for free?:
SIR1 | SIR Audio Tools
There's also the free Reaverb that comes with REAPER, for example. Can one IR be "better" than another? I can't see why anyone would spend $100 on one when there are several for free.