the .17WSM isn't a bad cartridge, it just fits into a tough little void
price per round is well into centerfire (30-34 cents per round)
the length of the cartridge puts it into centerfire action range....but as was mentioned, it doesn't pack as much as the .17 Hornet (my personal favorite .17 CF cartridge).
most companies, CZ included, didn't feel the juice was worth the squeeze to re-engineer their rimfire lines to accommodate the WSM...or so I imagine. And I can't imagine too many CZ 527's in .17WSM selling next to a .17 Hornet...some, to be sure, but enough to make it worth engineering the magazines to work etc...I doubt it.
For me, the .17HMR reaches out to 200 yds pretty well. Beyond that, I go to CF (.223Rem).