Bustabit rounds are COMPLETELY independent one of another.
Meaning its logically and just completely impossible to predict the next round based on any factor.
Seriously, you could try to analyze all you want regarding previous games, "red trains" etc.
Your EV with Bustabit is roughly -1%
Meaning no matter what you do you're guaranteed to lose -1% your wager over X number of games.
To put in simpler terms, this is a fucking scam.
The script does what it advertises, but you're right in that buying it gives you no competitive edge over any other script. On a flat edge game, there's no script that can be more profitable than others, I guess except a script that just all-ins your balance until you hit your target.
You're right, if the user could make money with the scripts, he would do so instead of selling them.