Buy the dofollow blog list

I sometimes get asked whether I sell “The list of dofollow blogs” …
To make it short: No – because there is not really one “list”. The dofollow search here on seo-traffic-guide.de always returns a fresh set of URLs that gets checked for nofollow/dofollow status when the search is made (with a little buffer for same term searches in a short time).
If you enter the same search term a couple of months later the list will probably look completely different because new URL will be found for that term…
I see that compiling such a list might be useful for folks who work for several different client in different niches. I know that there are other sites selling lists like that and maybe I could make quite a bit of money with that, but right now I have not met a product yet that met my idea of a quality list.
Should I go through the hassle of building such a list? What are your ideas – please tell me in the comments!