VIP is a scuba industry standard. DOT requires a visual inspection along with the Hydrostatic Testing requirement and suggests the annual VIP. The problem starts with liability insurance for a dive shop or dive operator The liability coverage requires the owners to make all industry accepted requirements to maintain coverage. This then requires that these owners have only properly inspected cylinders to rent and only fill properly inspected cylinders to operate a fill station. If an accident were to happen to a cylinder that wasn’t inspected the lack of insurance coverage could break the bank.
Now think about that.
If you have your own compressor and only fill your own tanks you may not need to worry about the liability unless of course the tank you were filling explodes takes out something of your neighbors but if you were standing around doing the fill, you probably wont have any worries anyway.