And there is no benefit to the performance of the car, your wallet excepted. More rotating mass and more wheel weight. The adapter may help your wallet if the offset works, while hurting performance, braking and accelerating.
For some people, they don't mod their cars for performance reasons. Adapters now-a-days have been stepped up.. go to a reputable company and get them.. don't get no boogie ass, Chinese adapters from Ebay.