This option is good and can be very beneficial for those that doesn't know how a particular gambling site works but getting acquainted to this site doesn't guarantee or it doesn't mean someone will win all the time if they entered the main gambling ( real money play). I believe majority of people that gamble doesn't only gamble for fun rather the percentage of people that gamble for fun are less while most gambler do it for profit.
There are those who gamble only for the fun, there are also those who gamble only for the profits and lastly, there are those who play for both, that is gambling for fun and still wanna make a few bucks while at it. For those who claim to gamble only for the fun of the game, then this option is definitely for them, because since they really don't care about the profitability aspect of the game, they would actually have fun by playing and not worry about losing their money while at it. While the real play is for those who gamble only for the money and for those who gamble for fun but still wanna make some profits while at it. It's as simple as that.