I don't live in BC but I have family in the industry and I've guided a bunch of Stones. In the good outfits it is much more likely for a hunter to miss or quit, than it is to actually get skunked.
There's still some awesome Stone hunting out there. The best thing you can do is talk to people...
None of the big sheep outfits in BC are allowed to harvest 50% over their yearly quota. Pretty much all of the big sheep outfits are well over 50% success. You are talking out of your A$$. There may be a bad operator here and there but the vast majority are honest, family run businesses.