Yes, think of the cost of PLEXing an account the rent to use sales on those accounts for up to 90 days before you need to get Omega again to update them all without letting them expire.
What you are asking is to multiply the provision by 4 times for the same cost it takes to do trading the way it is now.
This would result in people who don’t have to log in for a year to do their trading if they want. Cause oversupply on the markets that would push the value of items down like a brickwall against profits by eliminating the lack of supply to provide continuous demand of products that get purchased and eventually used/destroyed through game play and the necessity to have more supply that allows items to go up in value so traders can invest when supply is lower than the demand.
The loss of overall value on the market would make the savings on the cost to do trading by your idea irrelevant in the end and then it is that much more worthless for players to trade those items in the first place when it is that much easier to keep the market over stocked, pushing prices down and being able to ignore the effort required to manage taking advantage of better times to buy and sell on the market as well when there is less of a reason to invest in a drying up market or compete for buy orders when it is that much easier for everyone to sell their products on the market and less necessary to get cash flow in a hurry by seeding those buy orders in the first place that the players who keep the market stabilized depend on.
If this doesn’t make sense to you it is only because I spent five minutes thinking about my response to your suggestion but I am sure there will be others to come and go on into a deep conversation about why this wouldn’t really be a great idea for the economy of eve online.
My 2 isks.
EDIT: on the other hand this is a great idea to create an ever increasing isk sink of assets on the market whose value will be constantly pushing down further and further as time and players get to taking advantage of how much easier it will be to flood the market and leave it alone for a year at a time without any extra effort required being that supply will never run out and prices will never go back up.
TLDR creates that much more bulk in assets on the markets while killing it’s overall net worth.