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.
It is a very good point, as you say, by lowering the bet so much it is beneficial for many who could bet up to 30usd a day, and it is nothing for them to lose only that amount in dollars, but if you take into account that the slots time passes too quickly and the money that is spent sometimes is not controlled by some players, it is not a bad strategy, at least for me it is not because whenever I play with slots I like to enjoy it, if I win it is obvious that will give me joy, but for enjoyment I always look for slots, that is my point of view.