A Play subscription purchase is asked about without any offline check, so any token in the accepted grammar spends a read from the Subscriptions quota renewal checks share. The purchase path now takes one of a minute's 300 reads for each Play subscription it asks about, a tenth of Play's default quota; with none left, the claim is answered rate_limited with the seconds left in the minute and is not held, as Play was not asked. A claim already held takes no read, and App Store claims, verified offline first, take none.
Run: 007-subscriptions-retirement-lane, slice 3