Well to confirm something, when you hide something it increases the risk because people are not aware of it. Let everyone know how it was done and the ways they can find to stop it. May be by editing whmcs script or by server side security.
Second, Every one can decode this script or already know how it is done and its not of a high risk now. Scripts have been edited, patches have been made and its already secured. Then whats the risk.
To count in your knowledge, Sql injection was also a serious flaw in the website and was not reveled how it was done. That was at a high priority risk and just because of hiding something millions of sites were hacked.
Your way of think can really help people to understand online security and patch them as possible.
And if you can secure your website properly then you would have never posted a lame comment. Learn different things and share your knowledge