Saskatchewan's system moves title through Information Services Corporation's electronic land registry, which is reliable, but it does not prevent every possible problem, such as a forged discharge from a previous mortgage or a survey error that predates your ownership entirely.
The added premium for an owner's policy is usually modest next to the rest of closing, folded into the legal fees, generally $800 to $1,500, a Saskatchewan lawyer already charges, so the marginal cost of adding it is small relative to what it covers.
For a first-time buyer with no prior experience reading a title search, the extra protection is often worth the modest cost. Get your hand-reviewed valuation from Joel Dyck.