Eh. Not everyone listens, but some do. I bought CO detectors in 2015 as a result of reading your posts. Both tank gas and hotel room.I'm sure I'll keep some laughing for some time, but I don't care. I think ensuring that you have a life vest each in your room and wearing it if you leave in any emergency will work better. For $17 and 10 ounces, I'd suggest taking the smoke & CO alarm on any overnight trip, anywhere.
Although hotel room CO detectors are cheap, tank testers are not. I ended up with a cootwo because it eliminates the possibility of me being lazy and skipping that CO test.
...and I have actually detected CO in one of my tanks since then. It wouldn't have been enough to kill me but I did find some. After confirming the CO, the dive shop revamped their compressor setup as a result.