Are you saying it's short term because advertisers would notice? Sure some advertisers would notice. However I doubt the majority are capable of performing the

Are you saying it's short term because advertisers would notice? Sure some advertisers would notice. However I doubt the majority are capable of performing the OP's analysis (which could use some scrutiny). Imagine a 100 person company with 5 people dedicated to advertising. Leadership says to increase on-line presence. Some recent college grad on the advertising team buys FB ads. Next month leadership is pleased that they're advertising on Facebook. Also leadership is pleased that sales increased x%. The FB ads could be completely worthless. Some non-trivial percentage of clicks could be from bots and no one would notice.