No because we sold a substantial house in SW London to buy a very substantial house with large gardens in Surrey so we had change.
I suspect people underestimate the running costs of a bigger house and if they are maxed out with mortgage find themselves with insufficient funds. The utilities are double or triple, the council tax is high, it's too big to decorate yourself and it costs a lot more to maintain a house with 10 or more rooms than with 5 or 6. Add the gardening and the cleaning and the fact there is almost always a job that needs doing: jetwashing, pollarding, alarm service, ballcock in a cistern, etc.
And lightbulbs, changing the bloody lightbulbs is a complete pain in the arse and almost impossible to keep on top of. Oh and keys - we gave more keys than you can imagine and they have to go in a proper key box, carefully labelled.
We both work full-time, late 50s, and couldn't manage without a lot of gelp which adds to the admin.
No regrets, it's a beautiful house. Not silly big but an arts and crafts house sensitively renovated rather than executive new build.