No, price is not the only factor in evaluating Reverse Auction responses.
Reverse auctions are known for providing buyers with lower prices. A misconception of reverse auctions can be that the lowest price vendor receives the award. Price is just one factor in any evaluation, and the same is true when a reverse auction is used. Automating price negotiation allows buyers to negotiate more buys than otherwise and allows them more time for key procurement decisions, such as the award evaluation.