Why people sell their houses

The traditional reasons for people having to sell have been death, divorce or debt. You can probably throw in desire as a fourth one but it’s much less of a strong motivator sometime.

Of course they’re not the only reasons: people often say they want to downsize (Yes another D in the house selling list) but this is often something they dream of in a rather unrealistic way.
Wanting to sell your 3 bedroom house to go and buy a smaller place only works if the smaller places are significantly cheaper or you move to a cheaper area.
If we’re sticking with looking for D reasons then dementia would be one you could add to the list along with disease. We can throw in disability too. If you can’t get up the stairs anymore then you might want to consider selling up to somewhere without stairs.
Are there any more D reasons for moving?