I don't have the data, but my guess is that the majority of those who bough the KPA bought mainly for the amp modeling and weren't focused on effects.
If you think of it the other way, you might know what I mean. If the KPA had all these slots for effects and had great effects,but didn't have the profiling capability, as much as I hate to say it, I really doubt that it would have been a viable product. Meaning without profiling the KPA, wouldn't even exist. Again, not because the effects aren't good, but because the effect market is so saturated with very many and good enough contenders.
The last thing that guitarists need are more companies making effects, but no one has good profiling. BIAS are trying and they can catch up soon, so why not focus more on maybe the ability to use Stomp Drives and Distortions profiles at the same time as Amp profile. I know many say it can't be done but I don't believe that. Drive boxes shouldn't require the same horse power as Amp Profiles. How would you like a KPA that let's you play any tube amp, and put any profile of any drive box ever made? I'd like a lot better than getting all the additional reverbs and delays.