No it definitely is not. You absolutely could pay $20k as a client for two full business days of work on top of a 1000' broadcast tower by a crew of four guys,

No it definitely is not. You absolutely could pay $20k as a client for two full business days of work on top of a 1000' broadcast tower by a crew of four guys, repairing/modifying/replacing things, but not for just changing the bulb. If the obstruction lighting needed more labor intensive repairs or replacement you could easily spend more than $20k for a more complicated project. That video and social media post are a well known trope in the industry.