People don't consider it a reason not to go on an interview because 95-99% of job postings don't include it because they know nobody else does and they can get

People don't consider it a reason not to go on an interview because 95-99% of job postings don't include it because they know nobody else does and they can get away with it and applicants don't have a choice. If a reasonable number of postings included a salary range, omitting one would tank an ad's response rates and you'd see the trend change very quickly.