It depends on how you look at it. Rack repair is about much more than just the cost of the kit.
We've also created an infographic, which compares both options.
Replacing an upright is not the best solution as it's ripe for being damaged again as soon as it's installed. You also have to dismantle your rack and the beams to install the replacement parts, which takes time, and labor. By comparison, a DAMO PRO rack repair kit is a permanent solution that requires minimal unloading and comes with a lifetime warranty against impact. This means you can install it, and never worry about that location getting damaged again. Although the costs of an upright replacement and a Damotech repair are similar, once the values of time, safety, permanence, and ease of installation are taken into account, the value proposition of the repair becomes very clear.