Most of the time you are not buying. Exotic buying happens in short windows, and between them you are watching a handful of cars, waiting for a price to move or a spec to appear.
Watching carries no decision risk, so it costs nothing. The stakes arrive when money is about to move, and that is the moment a Deal Desk report earns its fee.
If you are always in the market, membership covers the stretch in between: value tracking, alerts, and report credits ready for the car that gets serious.