Those impacts can be positive or negative depending on how leaders and managers leverage the effect.
The IKEA Effect is a cognitive bias where people place disproportionately high value on things they helped create, even if the end product is low quality. Multiple experiments have been run to validate this in various situations and from the perspective of a seller and a buyer.
Depending on the situation and perspective, the person who helped create something valued it between 50% more and five times more.