Real Estate agents exist because everyday people, and the banks don’t want to spend the time advertising and shilling the property, so they hire people to do that for them, so that’s actually reasonable. It’s the same reason why most people will trade a car into a dealership instead of trying to sell a used car themselves; the “lost money” isn’t worth as much as the time saved not having to hassle over values.

That, and filter out the window shoppers wasting your time. If an agent is talking to another agent, there's a good chance the buyer is already pre-approved for a loan and serious about buying.