No one knows the exact amount because Chinese government has been cracking down on US$ leaving China since some time back when Xi Jinping became President of China, hence the ghost buyers. From what I am told, the general consensus among realtors here is that least two out of ten homes sold here in the Bay Area are to ghost buyers that they have never seen or met, only that they are dealing with someone from China either anonymously or through proxy such as an LLC. It is all cash so it is hard to trace and tabulate. There are actually companies in China and here that specialize in arranging these sales and birth tourism.
what you are doing is just typical know nothng xenophobia they used to say the same thngs about catholics and jews 100 years ago and even germans, you know when germans first came here they would niot speak the language or surrender their allegiance to the fatherland that ended pretty much after the backlash of ww1, ant german sentiment was to a significant extent respsible for porhibition, so would you ban the sales, immigration helps the economy, the atitude you express is manifest in japan, and japan is literally aging to death, i was born here you were born here, thats all it takes to be an american there is no american race but the human race