There is nothing wrong with having overseas money buying "some" of ours.

Just like there is nothing wrong with drinking a glass of water.

It's all in the volumes. If you try to drink a thousand glasses of water, you may well die of an imbalance, of an electrolyte imbalance.

And if you let too much overseas money flood in to your biggest cities, well, house prices that used to cost between 4 times and 8 times the average annual local income...

... suddenly cost dozens of times the average annual local income, pricing out young families who actually work at local jobs in the region.

That is not a well balanced situation for communities.