ASM Hydrasynth regular vs explorer

Can anyone explain the large price difference between the ASM Hydrasynth and ASM Hydrasynth Explorer?

Differences I notice are 49 vs 37 key, 8 mod fields vs 4, and pitch/mod wheels vs touch strips.

However the prices on Sweetwater are 1,299 vs 599. Why is the regular Hydrasynth more than twice the cost?