The cost is much higher and it takes much more than a "hacksaw and a drill". Go to the hardware store and online and try making any of my slingshots with $5 and half an hour time and only a hacksaw and a drill. Make a 30 minute youtube video where you show us the receipts of your purchases and where you record yourself making it.
I know you'll never do it, cause you can't.
Don't tear others down to make yourself feel good, especially in the slingshot community. There's better ways to spend your time. I welcome criticisms, but not hatred.