It's a give fact that most of us trade Alts to increase our Bitcoin Hodlings. Having said that, I'd like to know if anyone follows a strategy to increase their fiat balance by trading it against Bitcoin.
In my country and the city were I am living, trading bitcoin and fiat on localbitcoin is a common thing just that it is capital intensive compared to bitcoin and altcoins trading. Following what you said I suspect those my country traders are making decent profit in fiat for trading.
trading on localbitcoins is a common thing in a lot of countries, that is why it is called "local bitcoins" people who don't want to go to an exchange and buy bitcoin while giving all kinds of personal information will always go to places like localbitcoins to buy bitcoin from others completely p2p and as anonymous as possible.
although in some countries this is happening more if they have no professional exchange platform.