BitcoinHunt3r has already given an example above. $0.1 isn't a big deal here. I'm playing the crypto dice game at several casinos since last five years. Majority of the dice players hunt for big payout/multiplier. And most of them do pre-roll before setting higher base bet. Let's assume, you are looking for 990× multiplier at the dice game. There is a high chance to get longer losing streak. You have planned to do 500 pre-roll with the minimum bet limit. $0.1 will cost you $50 for the current min bet limit of Duelbits. The cost will reduce by 10 times if they set the min bet limit to $0.01.
You have a point. Its a good suggestion to lower the minimum bet. $0.1 might be small already for average gamblers but its not a pain to have an option if we want to bet lower than that right? In the end we can adjust our bet to how much we prefer. Well, I like playing Dice but its been a while since I last play it.
I do believe that lowering the minimum wager would cause them to have extra stress load by all the new players that will not be worth it. I mean at certain point you have to realize that there is a user acquisition cost and if the user spending is less than that amount then it doesn't worth it.
One person who gambles maybe 30 bucks a day and loses only 30 cents a day, doesn't really pay their load on the servers when they wager all day. Now consider this done in thousands, that becomes a big loss that doesn't worth the casino. As a person who loves to gamble very little, I would prefer if they lowered it to 0.0000001 satoshi if possible, which exists in some places, but I also do understand that it is a business and they need to profit.