Link Building is an important piece of the SEO puzzle and Link Consistency is very important during Link Building. Its no brainer Google and most other search engines love webpages which have more back links than ones with less or no back links.
One important thing one should keep in mind while Link Building is Link Consistency. By Link Consistency, i mean you should build links for the same url. Don’t mix your back links with the main domain and sub domains.
If i get say 100 back links for http://localhost/migration and another 100 back links for http://localhost/migration, the search engines are going to view it as two urls having 100 back links each. I would rather benefit by having all 200 back links for the main domain i.e http://localhost/migration.
Keep in mind having Link Consistency is an important factor in SEO.