Developers don't want to ever be paged because they don't want to be bothered, but the business might be perfectly happy to pay you to be on firewatch duty.
Consider a "low traffic" alert, how can you tell the difference between a slow period at 3am on a holiday vs a true outage? You can't without someone getting up and testing if the site is still up. (Maybe you can automate that check but there's always edge-cases you can't automate).
OP seemed to suggest it's better to disable the alarm than to just suffer the false alarm every now and then. I doubt very much that the people paying you for the on-call service would agree though.