It's all about surface area.
Once beads are an inch deep, all those beads beyond an inch are completely useless at transferring water vapor to the air. They do nothing more than hold water and wick it to the beads above. A huge waste of money, really.
That's why good bead container design relies on the beads never being more than an inch deep. Viper's bead tubes for instance. Absolutely brilliant.
A tubo filled with beads would work the same as a tubo with one inch of beads in it.
Now, if a guy was to perforate the entire tube, he'd have something. Fact is, it'd look awful and poke you and the cigars full of holes unless you took all the wickers off.
Just not a real good way to roll. David sells his tubes without beads in them. They are an incredible value, and an indispensable tool for using loose beads.
The material I use allows more surface area, but it's not something that folks can get easily and there's a large learning curve just to be able to make stuff from it. It's taken me 30 yards of 20" wide material just to get good at making bags and tubes out of it. That's a lot of beadbags.

If I didn't have the stuff I have, I'd definately be using David's Heartfelt bead tubes. They kick ass. Big Time.