Welcome to the Q&A Forum

I am not sure of the seo implications, but I would do everything I could to keep 1 installation if I could. It just seems like it would make management a lot easier. I may not be following what you are asking though. It sounds like you have a site without a blog using 1 worpress theme and then you are wanting to add a blog using another wordpress theme, is that right?

Thanks for the response.

Well, from an administration perspective, we have multiple sites already... so I certainly know the challenges and amount of time that can take. I personally am leaning toward having only one site, but am looking for some reasons why one strategy may be better than the other. I was wondering more from an SEO perspective since the administrative complexity would only be simplified with one site.

I also agree, any answers I get will probably be sweeping generalizations without knowing all the specifics of our business, and analytics.. so I am taking that into account.

We recently started using shareasale.com for affiliate marketing and have received literally hundreds of applications from coupon websites wanting to become affiliates. Most we have not approved as the quality of the sites is poor. However, a few sites seem more legitimate. Could having these types of sites harm our seo in any way?