I did a bit of research a month or so ago on 'hosted content pages'. It has a lot of other names too. See the title of this post. I found We Build Pages as one of the FEW companies that do it. Here's all the bookmarks I collected. The other two companies that do it are TextLinkBrokers and PreSellPageMan.
I have since talked to a bunch of SEO experts, and it seems that this is a grey hat area of SEO, which basically means that a bunch of them do it, but most don't talk about it.
I am not sure how I feel about it. I certainly see the value from the business side. I understand why search engines would frown upon the practice if the content is hosted for the purpose of gaming pagerank, etc. But, if the content is hosted for the purpose of serving visitors with relevant information, I don't see any problem with it. In the case of hosted marketing pages, it seems that the former goal is primary. These guys keep the listing of websites private that they publish these pages to. Of course, there's competitive reasons - if the brokers tell you what publishers will host content for a fee, there's less reason to work with a broker. But, the big reason they keep it private - so their sites say - is because they don't want search engines to be able to find the pages.
I've turned my energy a bit more towards the intersection of presellpages and SMO, if I must use your buzzwords. Adding transparency to the hosted marketing pages concept and doing it in a social setting - is not much different than going to a networking event with a bunch of business owners, all with their own agendas.
Sidenote: It'll be interesting to see how high this post ranks on a search for "Hosted Marketing Pages".