Maybe a silly question, but if the concept of a stable coin is to maintain market cap (i.e. coin price) by dynamically altering the supply and/or demand. (e.g. Tether, Ampleforth) then what is the potential for a return on investment? For example, if USDT is always about $1 what's the upside of investing in it if the price never goes up?
You just would need to use it when you need to go out in cash due to the market falling and staying on the safe side. The advantage here is that is easier than cash since not all exchange support fiat.
You dont gain anything by trading on a stablecoin alone, is just something to support the trading