As the investment in WT in Australia is primarily by foreign backed companies, not even the subsidy stays in the country. Same for CSG. In Qld much of the CSG is owned by Koreans, Chinese. They sell the gas overseas as the price is higher and the market can take the capacity. This means that profit (and taxes on sales) goes overseas with each boat load exported.
The downside for us, apart from ruining our water supplies and depleting the artesian basin and leaving millions of tonnes of salts by-product lying around that no one knows what to do with yet, is that we can no longer be charged a domestic rate for the gas as the government was not smart enough to hive-off a separate deal to guarantee domestic supply. From next year we will be paying the same international rate for our domestic gas as everyone else.