"Premium domain" is used for two very different things, and mixing them up is how buyers overpay.

1. Registry premium domains

These are names that have never been sold but that the registry (the company running the extension) prices above standard, often because they're short or common words. Watch the renewal price. Some registry premiums renew at the premium price every year, not the standard rate.

2. Aftermarket premium domains

These are names someone already owns and is willing to sell, often short, memorable .com names. The price is whatever buyer and seller agree. There's no official list price, and asking prices on marketplaces are a starting point, not a valuation.

What makes a domain valuable

FactorWhy it matters
Extension.com still carries the most trust and resale value in most markets
LengthShorter is rarer, especially one-word and two-letter names
ClarityEasy to spell and say, passes the "radio test"
Commercial meaningKeywords tied to big markets, such as insurance, loans or AI, command more
BrandabilitySome invented words sell well because they fit a brand
HistoryClean history with no spam or penalties is worth more

Is it worth it?

A premium domain is worth paying for when the name is your brand, when it will carry marketing spend for years, or when not owning it means customers, and email, go to someone else. It's usually not worth it for a side project or a name you might change in a year.

How to avoid overpaying

Read more: what a stealth domain acquisition is.