My grandmother filled up an eight room farmhouse, attic to basement.
Probably the memories of that are what keeps me in check.
My wife keeps me in check that and the money I get selling the stuff
I will have been at my house for 3 years in July and it's the longest I've lived in any one home since I was 12 years old. Moving a lot makes me keep things in check, although after 3 years here, it does need some consolidating, but mostly because my children aren't at school any more, so there's no need for study areas etc. Once I sort that stuff out and get rid of some unused desks, I hope to be back to just my stuff and a little of thiers.