You can't throw USD inflation in the mix when no banks/web2 offer you any good interest rates to match it to begin with.
I dunno what exchange you're using, but most have 0.075-0.2% fee per trade and hive to hbd is free not counting slippage/price movement.
you're talking about exchange fee only, I'm talking about the price spread too.
Converting USD -> HBD you'll see a lot more than 0.2% as a result
Yes I said it can be up to .2% fee per trade but I think it's farfetched to say you need 1-2 years of 20% apr/higher apy to break even
I was told about new %15. If you'd like, I can show you based on UAH (Ukrainian) fiat how easy you'll loose that %15 if convert to and from HBD.
I'm sure the situation with other currencies are more or less equal.