I think they're renting it out because they know damn well if they sell it they dont have a hope in hell of getting their money back on it.
Overpriced finished houses, plus fees, plus stamp duty, plus price of labour for ripping the whole things out and paying an army of people to redo every single thing for them with very expensive choices, all whilst paying rent of another million quid property.
But as a rental? I don't know many people who have their specific dull and gloomy taste who are looking for a house with a 300 plug bleeping editing suite in it.
Who does a rental house in the most expensive paint, with the most expensive appliances with micro cement flooring and overpriced wallpaper and pays someone a fortune to paint all the woodwork twice, because black wasnt quite right and it all needed stripping back to white again.
They have REALLY fucked this up if they are serious. I thought they'd made a financial balls up anyway, but if they lived there long term it may be ok. But clearly a month was it.
I think they both need a bit if bloody therapy. They rushed in with no experiance, made the house as expensive and miserable as they could, without a thought for practicality or the reality of actually living there, and then are still dissatisfied and want to move on after a month.
This was all one big ego and vanity project for the gram that has massively backfired on them.