That's a problem that many people don't realize. You make an investment, in bitcoin or whatever, of $10,000, and let's say after a few years it becomes $15,000. Your government is going to want to charge you on that $5,000 profit. But if we take into account inflation they would have to charge you maybe only on $4,000 of profit, because $15,000 does not have the same purchasing power today as when you made your investment. And if we take into account real inflation, it is even less. At 30% you should not be charged anything, because you have not gained anything, and you have probably even lost purchasing power.