Yes
I track a number of items but a block is a single item-type.
Each block represents a total quantity of items, such that I earn about a 10mil profit from it if I buy it at that price and sell it at that price. Simplifies the tracking of that sale of that block.
Yes this is included in my calculator.
If I have to adjust (modify order//relist) too many times, I have a low tolerance for it, maybe I will relist 3 or 4 times at most. This has to be considered for both buy AND sells. Since the relisting eats up the profit from both ends.
It is.
When I was selling Pi as a producer, I first sold to buy orders until I had so much rolling-stock that then I just put large amounts at certain price points. If the prices lowered, I held on to my stock pile, if the prices went up I keep feeding new orders.