I hired a coder to write this script for me, no one ever had it but me. I am selling it because I am leaving the gambling world. I made 50K USD profit and I'm done gambling. This is the amount that will make me debt free and I'm taking the ticket.
I'm pretty sure it's not the real reason. If your script really work for long term and make you easily get profit from it why would you rather to sell your script which make you wait people to contact you than to use and make more money by using it. It's just non-sense!
Also, the more people using script the faster that script will no longer works.