If you're going to sell something, you need to have some sense of what it's worth or you run the risk of being taken advantage of.

One of the most valuable things you will ever sell is your time and work energy. That's a sale worth tens or hundreds of thousands of dollars per year, every year.

It is incumbent upon you to understand the value of what you're selling, or else someone will lowball you and take advantage of the situation when you say "yes."

Maybe that's unfair. But it's just how things work.