Creating money by borrowing has a cost (interest rates for the bank and for the developer, plus a loss in credibility of the currency value); attracting foreign investment does not. Otherwise all countries would simply close their borders to capital, and they don't - they are actually desperate to attract foreign capital. The most dynamic economies, like China, hoover foreign investment which they then keep in the system, growing internal liquidity and reserves at no cost and strengthening the currency credibility.