Perhaps we can discuss this further in person during the Symposium, but at first glance I am strongly opposed to adding this sort of paid service to Hackage under the Haskell.org umbrella.
I share Duncan's doubts that the amount of money brought in would offset the amount of time spent implementing, maintaining, and supporting even just this feature, not to mention the fact that this would surely complicate development and maintenance of the open-source side of Hackage.
This approach also exacerbates the wart of cabal-install's interdependency with
hackage.haskell.org. I would much prefer to see a commercial vendor, perhaps Well-Typed or FPComplete, able to spin up proprietary Hackages as a service for commercial users, and for those Hackages to integrate well with
hackage.haskell.org.
That there is enthusiasm for this idea shows that there might be a viable commercial idea here, but Haskell.org is not the home for it.
Adam