why having many different prices of domain supplier?

[spencer]

I wonder why having some supplier sell domain the low price and the other do higher

[Lishmalinyjames]

Because there is nobody to set a maximum selling price for domain names. Because you get everything else in the market at a different price from a different seller and so is the case with domain names.

[saravanan28]

The price the customer pays to register the domain is often less than the price the registrar pays the registry for it. They aren't making money on that registration. ... It's also sometimes because some registrars make their money selling a WHOIS privacy service or other value-adds.