A domain name is worth what the market it serves will pay for it. Registration costs around £5 to £15 a year, but a clear name in a large market can be worth tens of thousands of pounds, because it is the one asset that every customer, search engine and AI assistant meets first.
A descriptive name does four jobs. It earns trust, it is remembered and typed without a search, it lowers the cost of marketing, and it signals the size of the business behind it. It does not, on its own, make a site rank higher. Google has said a keyword domain name gives no recognisable SEO advantage, so the value lies in how people respond to the name, not in a ranking trick.