Maintenance for the week of December 23:
• NA megaservers for maintenance – December 23, 4:00AM EST (9:00 UTC) - 9:00AM EST (14:00 UTC)
• EU megaservers for maintenance – December 23, 9:00 UTC (4:00AM EST) - 14:00 UTC (9:00AM EST)
I have maintained rank 1 on NA PC for the majority of both seasons, and almost always replace both my power cards as fast as possible.
If I managed to pick up an early midnight raid I will keep my black starter card, and if I picked up 2 red cards like reinforcements+siege weapon volley I will keep the fortify. Outside of these scenarios, I place super high priority on removing these cards from my deck whether that be with the treasury or with ragpicker/bonfire etc.
The advantage you have when it comes to affording 7 cost cards is massive if you removed these and your opponent did not.
The only other time I don't do it it is if my opponent has a split in their power cards and only gets 1 turn 1 and hundings is in play. Then I'll patron hundings turn 1, after that I'll treasury them. This is especially nice if I see a good 4 cost and I want it.