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I wouldn't use tape either, I grew up using old tubes as bungees, so I'd have a piece of an old one cut and use it to tie a spare one to the bike. Very swappable between bike, non sticky, no need of bolts/holes, cheap and can make many from one single old tube. ;)
Edit: I obviously wouldn't ditch the old tube, that's just more bungees!
Tape is sticky, normally single-use, disposable and not swappeable between bikes. Once you use a spare tube what do you do with the flat one? Ditch it? No thanks. Tying it down is better but still a bit of a faff and doesn't cover as much of the tube, this option is more protected.
Cost? Meh :) Anything related to bikes is £free :)
The double cage is just another option. I know some people who have already used their own version of that kind of double cage so there's definitely a small market for it.