The point of the mechanic is to be a goldsink and free plots which are no longer used.
You can save up to a month worth of rent, which should be enough.
Would a player really dont play for months, he would, by unlimited rent savings, block that plot for months for other players.
This could become a issue in the longterm.
There are different mechanics which got discussed as example a warning notification (which would not prevent it from happening when you push the game away for months) or that in the startertown a temporary chest appears with all your stuff from the plot where you can take it out when you come back.
However, people should not forget that saving stuff no matter in which form need to be coded and also take place in the databank.
