When a $40.00 cost is advertised as a $20,000 value, well...........somebody is stretching the truth.
For $40.00 you will NEVER, ever, ever get the perfect cam BECAUSE you will NEVER, ever have all the perfect data to imput into the program to GIVE you a perfect cam design.
For $40.00 you'll get a reasonable cam for the application but I'll bet you a dollar it's just a standard off the shelf lobe.
Also, these cam programs have been around since the advent of DOS. It's a tool like everything else.