Why so over the top (I mean really) over the top Water neck gasket

[Hawklover]

Mr. Gasket 738G..........prices range from $15.00 to $90.00!!!!!!!!!

[skyway]

Dunno about Chevys, but is it cuz folks don’t know how to make a thermostat gasket with cork & a ball-peen hammer?

[Hawklover]

I know Brad Bez recommends this gasket to stop any leaks that may present themselves on the Avanti surge tank. But like I said, the prices are all over the place.