Hearing aides are not cheap. For a moderate set will cost the price of a top end guitar. Not Sweat proof or dust proof.
Also the batteries. Not expensive, but adds up. There is also keeping up with the LITTLE things.. Removing for shower and activities where one sweats.
One went out in warranty. I lost one from constant sweating. Past warranty. Repair would be $200 -$300 with six month warranty hundred.
Water and dust proof available now, but there goes that custom guitar.
Sorry to bore everyone, but ear plugs are just a whole lot cheaper..