Son-of-a-meteorologist (retired early-1990s) here. At least at Cape Canaveral AFS, one balloon was released each day (sometimes more, if additional readings were needed). There was never an expectation of getting back the instrumentation. It is common for someone to find the fallen packages, with their light bulb and whizzing timer motor, and call their local police (and probably even more-so now).
I don’t know if they still release as many balloons as they used to.
Dad was also heavily involved with the various Loki rockets.
There’s a project here where undergrads launch balloons with various sensor packages on them, and they always try to retrieve them (some of the data isn’t telemetried down, and some of the components are reusable for other flights). But occasionally they lose track of it, or can’t get permission to go onto the land where it fell, and those aren’t considered a big deal. In any event the balloon itself isn’t reusable.