

Yes. In fact that’s how banks and brokerages try to retain FDIC insurance with larger sums of money e.g. Fidelity’s sweep accounts are actually spread across many accounts under $250k each. See the Deposit Sweep Program info at https://www.fidelity.com/why-fidelity/safeguarding-your-accounts

Not sure if this applies to the entire northwest coast but I had a friend from a small town in the northwest who said the water was colder and there were more sharks in those waters. So it wasn’t like beachfront property where people would regularly go swimming.
Also like the other comment mentioned those areas also tend to be steeper, more cliffs, etc so I imagine developing property around there could get expensive, and that’s ignoring if any of those areas are park / natural preserve areas.