Because of considerations like length, keywords, extension, brand-ability, market demand, previous sales, traffic, etc., certain domains are more expensive than others. These factors impact a domain's worth and its ability to produce branding, online traffic, and income.  Domains with a short duration, relevant keywords, popular extensions such as.com, and significant branding potential attract higher costs. Furthermore, domains that are in line with current trends have a track record of strong sales and attract traffic.