You are wrong. Don't say that if you haven't visited all dice site from new to older dice site. Primedice let you roll with 0satoshi, how about that?
Actually on Primedice the reason why they let gamblers bet with 0 satoshi is to try their chances, it is only for testing, I am not disagreeing with you but I guess you have a wrong explanation and wrong example of a site.
Actually you're allowed to be 0 satoshis to make pre rolls.
If you don't know what it means, its so you can skip specific rolls with no loss neither profit but you can sort of reset those upcoming streaks.