Would it be better if you will just show it in USD or USDT because players can easily tell how much they have if it is already in USD/USDT? So you don't need to explain it again and again especially for those new ones on your site. Anyway, it is the team's prerogative how they will operate their business.
Probably the script does not provide customizable balance unit, as far as I can read on the details of the script sales, there are some things that are customizable such as color themes, logo, banners, RTP/house edge.
Changing it to make it better is actually not a hard thing for the casino owner as long as they know how to do it because I believe it is just a simple thing to do.
Anyway, are those bets history real? There are many big bets (tens thousand credit up to more than hundred thousand credit) which means more than 10k USD up to more than 100k USD.
Just curious which gamblers are willing to risk such big amount of money in this new casino?