The quality discount is real and it comes from a specific place: a paid driver logs what matches a checklist, and a principal logs what makes them want to knock on the door. Those are different sets. In practice operators who've run both report the paid-driver list needs a filtering pass, and 30% to 50% of logged addresses get thrown out before skip tracing. So your 30 cents a record is really 45 to 60 cents once you account for the discard, plus your own time reviewing photos.
The fix that mostly works is paying for logged-and-photographed with a required note, then reviewing photos yourself before anything gets traced. That keeps your judgment in the loop and turns the driver into a camera with legs. Per-hour beats per-address for pay, because per-address pay is a direct incentive to log every unmowed lawn in the county.
Where your comparison to buying a list breaks down: a purchased list is built from records, so it gives you absentee owners, tax delinquency, code violations and equity position. Driving gives you physical condition. Those overlap less than people assume, and the intersection of the two is the actual prize. A paid-driver operation isn't a worse list buy, it's a second, independent signal you can cross with the list you already bought.
One thing to settle before you scale it. Whether a paid driver is a contractor or an employee, and whether logging leads for compensation trips any real estate licensing requirement, depends on your state and on what exactly the driver is doing. Some states are far more aggressive about unlicensed activity in the lead-to-contract chain than others. Get that answered by a licensed attorney in your state before you have six people on the road, not after.