There's more to a job than the salary, and it can be reasonable for a company to leave salary ambiguous in order to make that sales pitch. Sometimes it's half the company; sometimes it's a set of steak knives. And it's reasonable for an applicant to decide that they're all about the salary and don't want to waste time on the sales pitch, and move on.
When you make the salary ambiguous in order to make your sales pitch, you are being unreasonable.