Many players don't understand that these games were created for:
1. Make money.... I mean the site, not the players ;
2. Having fun... fun involves paying for it, not the other way around.
Making money from these games is rare, and users shouldn't be aiming for that.
By using scripts you are dropping all the fun, and most of the time, increasing the speed with which you lose money to the sites.
No script has a magic formula to minimize your losses.
There was a guy who made profit almost 400 btc from bustabit. He was an user, what do you think?
Oh believe me, most of people choose to gamble because they want to earn money, not for having fun.
There is nothing wrong with using script or betting by manually. I myself also find it would be more "fun" when your bet is automatically running by bot, imagine you have to work or doing something else and seeing your bet is running. i'm really enjoyed it