Throwing out the "perk" of providing free performance enhancing drugs to their employees means their average employee will become less effective, either because they won't be on performance enhancing drugs or because they will be spending time walking around to get performance enhancing drugs instead of working. So the average employee is making less money for the company, so they are payed less, not more.

In numbers it goes something like they can pay you and extra buck a day for not having the coffee machine, but they simultaneously have to cut your pay 10 bucks a day for the loss in productive work being done. Your 9 bucks a day and free coffee down in the exchange.