The factor "ratio" is the number of base bets that our balance can be. I mean that if your base bet size is 1 unit, your balance is equal to "ratio" unit. Say ratio = 1000000 as I recommended, you can play on Primedice with 0.1 Litecoin and a base bet is 0.00000001 Litoshi.
For a experienced gambler, I consider this game for fun, never for money. So should you all. But if you are "professional" and wise, you still can earn money from this strategy. It is safe and profitable in short and mid terms.
If there is no minimum amount to bet, I guess people will try to use the smallest amount, such as 0.00000001 coins, to gamble. That is what I will do if I want to play gambling. But some gambling sites have a minimum amount that we can use to bets, so we need to use that to gamble.
If you consider using gambling for a fun thing, you can select anything you want, including using many methods that you know to see how good your luck. We can earn money from all strategies, but that will depend on your luck because gambling needs to have the luck to win any gambling games.