Yes,
We are selling ads by the month in Indiana on rotation(restaurant & retail). We tell advertisers the ad (10-12 seconds) will appear 10 times an hour minimum, 15 hours a day, 7 days a week.

We also place ads about the place our board is in (Example: tip your waitress...)and comical photographs to keep people looking.
We are just starting out and things may change, I'm sure. Cost is set right now as follows:
1 month $50
3 months $45 per
6 months $35 per
12 @ $25
second ad or location add $10 per
ad change out $10 per instance
Plus charging for ad creation.
Pushing for the 12 month commitment prepay and keeping in mind that Election & county fair ads will only want a single month, they pay our premium of $50
We are in a rural area so the money is not as high as in a metro area.