Houses should have a monthly fee

[worldofneil]

Why this problem even exists: There is no downside or cost to keeping an abandoned house for basically no reason. You don't have to pay anything, you don't have to do anything with it, you just have to enter it every 45 days.

Except you forgot that this means you do have to pay to keep your subscription going which is real money...

If people are already doing that, paying some in-game money isn't going to be much of a deterrent.