We pulled all the previous nightlies because we wanted people to be on the official OTA base before installing Liberty to make sure everyone was starting from the same position. It was simply a choice of wanting consistency among the users in terms of the 'flash' path so that we could keep things simple.
I do see your issues with our removing those previous files and I'll talk with jrummy and see if we can work out another solution. We originally intended to include the zips you'd be able to find over at MDW, but P3 was unhappy with that. I'd wager it is because he needs the popularity and the ad revenue.
I don't have a timeline to offer at this time, but I do thank you for your input and hopefully we'll be able to work something out in the near future.