They make investment decision, what to make, where to invest and so on. On its own it is extremely big power.What make you think that billionaire make decision on the life of Chinese people ? Because they are not
If you see the composition of CCP inner sanctum most of them are either "princeling", Academician, Bureaucrat, or career diplomat. but sofar I know none of the billionaire ever inducted into the inner sanctum of power
And finally, they can bend the decisions/ laws .
They don't need to be in the power, but they have way more weight in the political decisions than say you.
Or say that how many average Chinese has the same weight like a billionaire ?
1 million, 10 million, 100 million?
Finally, can you prove that the billionaires are not simply the material realisations of the power in certain circles?
I mean, the politician doesn't has money, but hes network has, and it is coming from him.
This is the typical way how the government / private sector relationship works in the US example.
And if it happens in the US, why China is an exception ?
Considering that in China the level of corruption is higher than say in USA, it is safe to expect that there is many more revolving door and deeper connection between the government and private sector.
I mean, China is in the same league like India regards of corruption perception.