If I understand correctly, setting minValueBtc makes CryptoETF ignore coins which have a value under a certain threshold. Good for ignoring dust or coins with zero balance. Much like the "Hide 0 Balances" option on Poloniex' balance page.

However, I am doubting whether minValueBtc is doing what it says it does. The only time it is checked (as far as I can tell) is by updateHighestRankWithBalance(). This means that despite having minValueBtc set, coins with a value below minValueBtc are still displayed.