Volume can come from a high number of low-effort transactions, aggressive marketing spend, or a large team splitting the work many ways, none of which is inherently bad, but none of which proves fit for your particular home. Ask for their closed sales specifically in your price range and property type over the last 12 months.
The Saskatchewan Real Estate Commission's register confirms licensing status, not skill, so licence checks and volume numbers both need to be paired with a direct conversation about your specific property before you can judge fit. Ask how they would price and market your home specifically, not just how many homes they sold overall.
Joel Dyck will tell you plainly whether your property fits how he works, rather than pointing at a general sales count. Get your hand-reviewed valuation from Joel Dyck.