Ever since Google has started rewarding a lack of optimization and opened up to an emphasis on CTR optimization in title tags, I’ve had some theories that some words in particular seem to give a “boost” – either correlative or causative, in the ranking of websites.
While I don’t think there’s really any magic bullet, I’m fairly confident certain types of pages just tend to get more links and/or interest – and on the flip side, certain word additions in titles tend to get more clicks and/or interest – that may both strongly connect to ranking better in the search results outside of simply stuffing in several other keywords…