This is the way this site has always worked.
The prices are set not by how much real life currency exchanges for how much imaginary. Prices are set by who has how much of what, and what people are willing to pay for that. If you are unhappy with the ratio at which people are selling gc, fine. Do not buy it. But do not expect them to change their prices just to please you. As long as people are willing to buy it at the prices that they want to sell it at, its not going to change.