Why not just treat the assigned parking a standard perk (considered in the overhead cost of an employee) and offer a cash bonus to those who elect to not have a

Why not just treat the assigned parking a standard perk (considered in the overhead cost of an employee) and offer a cash bonus to those who elect to not have a spot? That would maintain the perception of the parking being free, while allowing for a reduction in usage based on the same value assessment described in the article.