Why is it nonsense?
City are valued at an estimated £4bn but we only make what £80m profit per year? Did the Sheikh really buy city because he wanted a business that made £80m a year? That's nonsense.
The Sheikh bought city as an asset, he originally paid £200m and if city are apparently worth £4bn then that's a mere +1900% return. Assets are valued by what somebody else is prepared to pay. City as a brand for example are worth something and so is our intellectual property, you can't reduce that to a profit/loss account.
Tesla has 3,198,000,000 shares in issue and they're currently trading at $400 each. That's a market capitalisation of $1,279,200,000,000 = $1.28tn. Do the same maths for Ford and they're worth what $40bn? Musk could easily buy Ford if he wanted to, it would make far more sense than buying Twitter for $40bn which never made a single penny of profit.
If you had to invest in a future asset then ask yourself today would you rather hold Ford shares or Tesla shares? If you had bought Tesla shares just 5 years ago then you'd be sat on twenty times your original investment whereas with Ford you'd probably still have whatever you started with.