Their is no "gas" being released. It's a vacuum. So when broken, it's actually sucking air in.
I would recommend NOT "smashing" the glass, because it contains large amounts of lead and phosphorous. Really bad for the environment, and you.
If you're going to scrap TV's/CRT's, do it responsibly.
As for how much you can make. Somewhere between $1-$7. All depends on what you have. Only way to know is too pick them up and figure it out.
Good luck!
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