CO2 tank visual inspection - Rip off?

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OK for years I got my CO2 tank refilled at the same place, it always cost about $30.00 for a 10 pound CO2 tank, probably a bit high because I live in a small town. Every so many years it needs a pressure test, I forget if it's every 5 years or so.

Last time I got the tank refilled the guy said "I had to vis it" ie. do a visual inspection, he claims this is necessary every year, it sounded like a bunch of B.S. to me but I thought I would check here. Charged 30 bucks for the CO2 and another 30 bucks for "visual inspection". They are the only CO2 place in town. I'm just wondering if there is anyone else had this happen to them and if the regulations for inspection/pressure testing of CO2 tanks are posted anywhere on the internet.