In nearly 22 years of working with tree tubes and grow tubes, I have pretty much seen it all.
Years ago I had a customer in Iowa who used 2ft tree tubes on his sweet corn! He said that with grow tubes his corn was ripe 2 weeks earlier than everyone else's - and every knows that first sweet corn of the year is worth twice as much. He only used the tubes for a month or so each summer, then stored them in his barn the rest of the year. Figured they'd last just about forever, and would pay for themselves many times over.
He's probably still doing it yet today... and hoping against hope that his neighbors don't catch on and start using grow tubes on their sweet corn!