When the Rarity Provision House was introduced, it produced at the same speed as a fully upgraded Provision House.
This can be seen when producing buffs for scenarios.
However, in the meantime, the Provision House has become upgradable to Level 6.
It would be nice if the Rarity Provision House would keep up with times.
Possible solutions:
1) Make the Rarity Provision House as fast as Level 6 Provision House.
2) Let us upgrade the Rarity Provision House - even if only once. Maybe through a quest, like the Epic Woodyard?