I've purchased the really cheap hearing aids to the more expensive hearing aids. They all have died completely within one year.
I even purchased the cleaning tools that they all said that I needed to keep the hearing aids working beyond a year. They are extremely over-priced for the technology that goes into them. They are a major industry for ripping off the consumer. Hearing aids are not covered by insurance, probably because of these facts.
They are equally important as eye glasses are, but it is still considered an optional resource. Hearing aids belong in regular retail markets at a substantually reduced price. I think $20.00 per aid is plenty for what you get. But I suspect that people would easily pay $100.00 a pair per year if they were readily available.
The ITE types should always be made with silicone for the insert part, otherwise, they cut the inside of the ear and cause infections. Many issues here to be addressed.