Pays for itself. I think so and here is why. Been drilling metal, mostly steel, all my life. I have worn out tons of drill bits over time and I am only a hobbyist. On current project drilling a small set of drill bit sizes over and over for a year now I still get good performance from the select bit sizes I frequently use. 1/8" pilot comes to mind as I use than on everything to get started. Yep still on same bit. I decided to use an old 4oz can I save for tapping this past year on drill bits. This greatly improved drilling performance and as noted extended drill bit life. Like the results with drill bits so much, I started to apply to metal cutting bandsaw, steel cutting chop saw, etc. This is why I purchased the 16oz size of Tap Magic. I pour it in four squeezable oil bottles with needle type tip and keep one at every cutting station.