What's to stop you designing your own 5 star logo and sticking it in the window? Probably just as effective.
I've never seen the salon guide pop up on a google search and I don't read trade magazines. So any such advertising would be lost on me.
I got my fingers burned quite a few years ago and been cautious ever since.
Me and hubby often joke about takeaways that boast 'voted the best in the northwest' we always laugh and say, 'by who'?