Hi Tracey -
Just wanted to defend agents who don't use tubes as I'm one of them! For many years I did this but found that the flyers were picked up by neighbors more so than those who might have an interest in the home. In inclement weather, they often became damaged due to rain and high humidity and sometimes turned into a soggy mess. I've also had kids roaming the neighborhood at night remove all the flyers and let them blow around the entire neighborhood.
More so, however, I wanted the chance to do one of two things - either describe the home to a potential buyer in detail over the phone to try to get them in the door or I wanted to encourage them to tour the home on my website so they could enjoy reading about all the amenities and viewing 30 or so photos.
So, rather than a tube, I have my cell phone on one sign rider and I have my website on the other. I regularly get calls on my listings or have people visit my website to learn more. For me, providing flyers with minimal information seemed to be more of a negative than a positive. I was afraid it was causing me to lose potential customers rather than gain them. I think the analogy I would use is that if I was out shopping for a new dress and Macy's had one page flyers describing each of their dresses, the dress of my dreams might not look as good on a flyer as it would in a catalogue on the web. But, a good agent would do what their seller directs them to do, even if they disagree.