These scripts were not designed for high concurrency. They rely heavily on heavy database queries for every page load. As soon as you get more than 20-30 concurrent users, the script will likely lag or crash your database.
Use a three-act arc for a compelling script-based campaign.
: Two-factor authentication, administrative dashboards for monitoring players, and "provably fair" betting logic. Communication
In the world of nulled scripts, if you aren't paying for the product, you aren't the customer. You're the product.