As of a couple of minutes ago there were 365 left plus 50 disable/ambulant.
Looks like it will sell out today.
Oddly though I don't believe block A6 has been on sale yet?
I think what has happened is that people now understand how the points system works and therefore know there is no rush for tier one purchasers.
Also a lot will have mixed groups where part of the group is in tier 2 or 3 so it worth waiting to get the tickets together.