As soon as you counter offered and they said they bought another name you should have dropped it.
I doubt, they were serious. If they were they would have countered 150. before your multiple exchanges. Dont sweat it. Any time someone offers just...
These is a lot of information missing on the whole deal. what works for a larger company doesn't always work with a single or small set up, and vice versa. So you need to find out what type of business it actually is for the right approach. Also...
Tell them it protects their reputation as another Salon could open with a similar name and have terrible service, etc.
It allows them to control their brand and not have some non professional random google search results. It ads value to their...