...so since getting my shadow pet, I've noticed something really dumb on the pet food market:
There's tons of stuff offered, and hardly anything actually sold. I'm saying this because I pity pet food sellers, and can only imagine how much they lose from failed offers that don't sell while having to pay the fee.
If you're selling pet food, try not to post too many offers. Demand isn't stupid. If plenty of people sell, then demand will believe supply is desperate, so it won't buy. They'll anticipate that supply will be willing to lower prices further into the future. On top of that, the lost fees make it costly to sell so much, and demand anticipates that supply will try to make up for lost fees as well.
The gist of what I see is when there are 5-7 pet food offers up on any given level, they will sell out. Anymore, and the market stagnates until price crashes 33% below the price floor where all offers will be bought up at the snap of a finger. Then, the market waits for old offers to expire before reassessing...
...so yea, keep that in mind if you're selling pet food.
Also, I tend to see the following price floors for shadow pet food (and sorry, but I don't keep track of power or divine food since I got my Drakon fed purely on food I made myself and never got interested otherwise):
250 for motes, 500 for dust, 750 for stone, and 1000 for orbs. Stars go up and down depending on material prices, so they're not really stable. I usually see them with a 2000 price floor, but they can go from 1500-2500.
If the floors don't exist because the quantity supplied has crashed, then prices tend to double for motes through orbs. That means 500 for motes, 1000 for dust, 1500 for stone, and 2000 for orbs. I've never seen stars go above 2500 either even when there's no floor.
Try to use that for a price guide if you want.