Most audiologists sell bundled services–aids, programming, and maintenance. I suspect that top of the line HA, that often sell for $6,000-7,000, cost the audiologist 1/3 that, maybe 40%. The rest is for service etc. Say they are of high integrity and decency, so they do not steer you to more expensive than you need. Still, ~ $4,000 is on the table after you have received your aids. They have overhead and deserve a decent hourly fee.
Unbundled, one might purchase the aids for say $2500-3000, from somewhere. But most audiologists will only work on HA they provided. And they sell bundled HA. There’s room for practices that encourage users of orphaned HA (bought wherever, maybe used, maybe the audiologist practice is closed, maybe you have moved…), and presumably they will charge by the hour or the visit.
Some audiologists will take on the orphaned HA, but many won’t. House here in LA won’t.