Why cant we own multiple appartments?

[LotteYanson]

Why can we only have 1 appartment?
most appartments are empty. just give us more.
those that get more appartments wont stop playing if they have 3 instead of 1...

i dont want to trash my designs every single time i want to try something new or beg others that i can decorate their place.

or at least give us an backup option, in worst case even a local backup would be enough.
(a room design should be less then 4kB (uncompressed); 1TB could hold 250,000,000 designs then lol)