Maybe cleaning the house now and then and throwing away the useless garbage and selling the stuff you have not even bothered to look at in the last 10 years or more would be a start to resolving your issue. When you quit and the house IDOCs you know what will happen to 90% of the stuff....... it will go to luna bank and get dumped in the trash can. See it every time a Castle full of STUFF that is only worth turn in points falls. Just do what I do a couple of times per year when castles start getting full......... demolish the castle.......... replace the castle take a glance at the pile of trash under the house sign and log out. Storage problem solved and not a thing you will even miss 24 hours later. And you have a empty castle to start filling with all new garbage.
Have you seen, since we are in Halloween, for example at how many Pumkins types there are ?

Now, currently they may look as nice and usefull to keep because it is Halloween time, yet, if we were making this discussion in spring/summer, perhaps they might be looked as trash to throw away and other items to be kept...
Yet, how much time it took to a player to get the carving kits and all the rest to then put together all those Carved Pumpkins ?
What I am trying to say is, that behind ANY item that needs some sort of farming, unless one uses AFK scripts, there is a player's chunk of lifetime...
Throwing that item away, means, at least to my viewing, throwing away however many hours of a player's lifetime it took to get that given item, as if they had not lived them....
Some people may be less concerned about their time, other people, may instead value it much more highly.
So, to some, throwing away stuff that took time to gather, might not look as the proper thing to do.
But, of course, different people think differently.....
Do you save everything in real life?
Why not?
Now i hate real life brought into my game but there has to be limits you have been given multiple suggestions you refuse to add a second account despite claiming you're willing to spend the money on a one time thing but guess what the extra space will go fast and back to the pusherman you go ..
Just toss some useless stuff empty those stables..