I’ve never been all that keen on repurchasing albums I already have, even with the incentive of a couple of bonus tracks.
I’ve made exceptions when an album I already have is repackaged with an additional disc or a bonus DVD.
As for an Archive series, I suspect Genesis management has weighed the fact there is a plethora of live recordings that have been freely available for decades and most fans who are enthusiastic about this sort of thing likely already have the ones they want.
That luxury has also placed fans in a position where they can be critical of the purity of an official live release, and opt for a bootleg instead.
So the question is what percentage of fans would be charitable enough to buy a recording from a concert they already have? Can they make money from this? Ultimately, is it worth the trouble?
After all these years, I can only assume they concluded not enough people would purchase or download these recordings to make it worth their while.