Gonna sit on my half-empty tank for party balloons from my daughter's birthday, maybe we'll be able to sell it to pay off mortgage quicker than the helium itself escapes the tank.

Store the tank upside down so it doesn't leak out of the valve ;)

Same energy as "buy bitcoin" in 2011

Unfortunately bitcoins don't leak from storage tanks on their own.

That's another lifetime-limited thing -- the helium leaks out, and you cannot (for practical purposes) stop it or even meaningfully slow it down. When it's gone, the drives are dead. And the helium leaks by calendar-days, it doesn't matter whether the drive is powered on or off.

Non-helium hard drives are basically limited by their bearing spin hours. If one only spins a few hours a week, it'll probably run for decades. Not so with helium.

I'm using the drives, not hoarding them, so normal wear and tear is likely to be a problem before helium depletion enters the picture

You just have to put your hard drive in a pressure vessel filled with helium.

It’s helium all the way down