I have a website on alternative / mysteries, etc. If I add a new sub section with articles on how to make some cash, do you think this would hurt me at all in the search engines? The articles would of course be unique and non trashy. Cheers
Why not start a new site with those articles? It's better to have websites with a clearly defined niche. "A jack of all trades, is a master of none"
It should not hurt anything in the SEO. However, for the small cost of a domain name, it may be better to start a new site with the articles.
if you are thinking of relevancy within your site, do not worry it will not hurt to add different niche...but better to register a new domain if you want to make money out of it