He’s got 75 toons with 25 accounts. A human being has a limit to how many screens he can simultaneously manage at one time. Everyone also has a limit to how much they can play in a day (at the very least… we all have to sleep sometime).
Even if you were capable of actively playing 25 instances of Eve at once without breaking the EULA (something I cannot actually imagine… but let’s say it can happen)… that’s 25 TOONS. If you maximize your isk using 50 toons in total (switching which are logging in to manage manufacturing/PI/invention/ratting/whatever else you do to earn isk) over the 5 hours a day you play EVE… that means you have 25 toons that you do not have the capacity to use to make isk… because any time you use for them would be taking away time from another toon doing the SAME ACTIVITY.
If that activity were invention… you as a player would spend an hour on invention with one toon or an hour with another… you aren’t engaging in an alternative activity. It’s like saying the opportunity cost for watching TV shows on one TV would be not watching TV shows on a different TV.
I’m viewing the player’s time as finite.
I’m viewing the player’s “multitasking ability” as finite as well.
That means each player has a limited amount of capacity… expressed as number of sessions able to be simultaneously managed multiplied by their available game time.
AFK play is outside of that capacity. If the player is sleeping and logged in… he’s not using capacity. Any opportunity cost isn’t things he could do while actively logged in… it’s other things he could do while sleeping.
Look… for about five years I designed and coded programs to deal with product planning, cost accounting and industrial engineering for a decent sized manufacturing company. We determined the cost of various product lines to painstakingly annoying detail… allocating things like travel time between machines for employees, projecting breakdowns and mistakes and even allocating the amount of time janitors would have to clean up waste from the machines to the final product made.
Certain things were unlimited. But other things in product planning were fixed… the main thing being the floor space available for machines at the plants. When planning a product offering and looking at the various options to determine which things to create… that capacity limitation was critical to take into account.
There are two possible limits to capacity in EVE. First is the number of accounts/characters. Second is the time and attention a player has to spend on his accounts. With a small number of accounts… the first is often the limitation. With a large number it’s the second. And unlike a company who can hire new employees… you aren’t supposed to get other people to play your accounts in EVE.