I just had a quick read of the last few posts here. As others have said the thin affiliate site on a related domain is long over. Like others, I have been dropping domains because it is too expensive to keep them all. However, I am just trying to shift this content to a few big sites, and then rank them. The problem with the model is that getting any natural ranking for a particular page is very hard. You need to get links in, but it's not really economically viable to spend time doing that. What is a shame is that the time people spent building all these niche sites has little chance anymore of being a future revenue source, but that's what happens if you are solely reliant on a search engine algorithm for your business model so that's a lesson I guess.