I was thinking of putting a virtual store on some of my pages with products and the thought hit me; is every product that I put in the virtual store an outgoing link from my site? Is this the case? Would I be killing the (less than super) link power that I have by listing products at the top of article pages?
yes, each of those links will count as an external link. having some external links is not a problem. it is a problem when you have external links that are not related to your site or have too many of them
How many would be harmful? Is there a way to determine how many one can have on each page without hurting the performance of the site? I will be listing items that are relevent to the articles on the page.