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I don't think there's any fun in playing games for free, who would want to play Dice or X-Factor with just 1 Satoshi!
However, before depositing a large amount on any site, everyone would like to try the games on that site first. In this case there is no limit of minimum deposit, this is a very good aspect. So betting opportunities with 1 sotoshi is good for newcomer to test the games, you can bet 0 sat but I don't think it will give you actual taste...
First of all, you need to differentiate between 'betting' and trying the site and I dont think playing with 1 sat is considered as 'betting'. Secondly, there is almost no difference between trying the site with 0 sat and playing with 1 sat dust bet. Thats merely 0.03 cents right now , its pointless and you might just want to go with 0 sat wager