This logic is based on, that if one domain can bring in some rankings, just think of how many rankings 10, 20 or 30 domains could bring in. Another reason for doing this is the belief that keywords in a domain name alone are a secret weapon to obtaining high rankings. This is not the case, major search engines such as Google frown on improper use of multiple domains as they can have a negative impact on relevant search results and can affect a user’s experience.
However, there are ways that multiple domains can be used for positive effect allowing your company maximise the use of multiple domains to target specific markets and products / services advertised within your website.
Multiple Domain Strategy
biznet IIS can provide recommendation documents for companies wishing to a adopt a multiple domain strategy without causing duplication issues within Search Engines. This strategy outlines how Domain Name URL’s can be used to maximise exposure without have a negative effect on your website and primary URL.