So they're less leveraged than most American home purchases of 5~20% down payment. 30-year mortgages are also standard in the U.S. You emphasized "NEXT 30 YEARS". Do you think it should be longer or shorter?
>5. The bank gives 60% directly to the real estate corp. So in fact the citizen IS OWING MONEY TO THE BANK, and not to the estate corp.
That's how mortgages work. Why else would a bank be involved if the money is still owed to the seller? Do you think mortgages shouldn't be a thing, that people should save up 100% of the money then pay in full when purchasing a home?
>6. Often, the real estate corp uses this money to pay back previous loans, or use this money to purchase more land from the local govt. So current (future) constructions pretty much depends on whether this Ponzi scheme could continue.
You keep describing how this works in most places as if it's something outrageous.
>8. ...until no typical citizen will be able to afford it.
We're way ahead of China getting to this point here.