Why does a link with no local fit tend to disappoint?
Google says local results are based mainly on relevance, distance and prominence. Prominence includes information from across the web, such as links, articles and directories. In plain words, it is how well known your business seems.
Think of a link as a reference. If a neighboring shop, a local association or a regional news page mentions you, that reference fits. It tells readers and search engines you are a real business in a real place. A mention on a stranger's site about unrelated topics says nothing of the kind.
Nobody outside Google can say exactly how much any single link counts, so be careful with anyone who claims precise results. Many practitioners find that a few well-matched links are more useful than a large pile of mismatched ones.
