I worked doing lighting for a 'Disney On Ice' show that lasted a week. They used lots of ropelights in the show. Sections of them would always stop working. They would need to be repaired on a weekly basis. One of the guys that traveled on the road with the show said "Ropelights are of the Devil".
If your lights are hard to get too, then I would try to figure out some lighting that is more permanent like LEDs. Or make things easy to replace like lots of outlets around your advertising to easily replace ropelight sets, or lights in sockets for easy replacement. If you can run ropelights a little dimmer, you will get a LOT MORE life out of them.
I see a lot of ropelight advertising around here, It looks great in the beginning but after a while the weather messes it up and it never seems to get fixed leaving a bad image of the company.