When you go from strength, people respect you more. When you are desperate to make a deal, you end up a loser. Being willing to walk away and giving an ultimatum shows clarity and confidence.
When you are busy and hard to get people want you more. When you are always available then people respect you less. People will only respect you as much as you respect yourself.
When your fees go up you are sending a signal that you are in demand. When your fees go down you are signalling trouble. Perception is indeed the reality!