the problem with your combined wiki is that I think your theme is a little too broad.
you can sum up wikipedia in a single word: encylopedia.
When I look at your wiki, I can't easily predict all the information I could find there.
When you tell me your site has all product information... well... what does that mean? What falls under 'all?' a faq doesn't really fall under 'product information' to me. That is, your scope is so broad that you fail to sell your product to me since my needs are more specific.
you can sum up wikipedia in a single word: encylopedia.
When I look at your wiki, I can't easily predict all the information I could find there.
When you tell me your site has all product information... well... what does that mean? What falls under 'all?' a faq doesn't really fall under 'product information' to me. That is, your scope is so broad that you fail to sell your product to me since my needs are more specific.