Well I am sure that if I was getting 6-7 per week I would not be here posting about the lack of pet food. and yes I see all but 1 cycle in the MA and nope no pet food since the FA was running.
Well I looked it up for you on the account where I actively craft on 2 worlds.
Last 14 days:
World 1: 13 petfood
World 2: 12 petfood
I might have missed 2-3 recipe pools on the second world because I was lazy and lame in the morning and not in the mood to log into both worlds.
anyway it aligns pretty much with what I have seen since the recipe change in "pools" of items.
There will be weeks I get 9 there will be weeks I get 4, but on average it will be 6 to 7.
Seeing all recipe poos but not seen a single pet food in 3 weeks is not impossible but more than extremely unlikely.
On average the spire should reward 5 premium houses and 2 workshops a year, It took me almost a year and a half to get my first on my 2nd world (2 weeks ago I think) so really bad luck is always a possibility. but normally bad luck is followed by luck, at least thats what I hope
But if you arrange the recipe switch scedule in such a way you see all recipes (you can use a 1 time diamond expence to set the time in your favour) if you are frugal, stick to the 6-7 rule and have some reserves to survive bad streaks you should be have enough and you would not have 0 but more something like this
This was partially made in the old days when we got an overflow of them, but ~66 of those are from being frugal and knowing how much you can get/use. this is not based on luck but on carefull calculations.