Bamboo is cheaper, but it is also lighter, quicker to install and take down, flexes in typhoon/hurricane conditions rather than breaking at the joints and does less damage if it does fall, sustainable and apparently doesn't burn all that easily - I suspect the main culprit is the netting and cladding and whatever the contractor was storing around and on the scaffolding. Awful for all concerned. Apparently the contractor has been issued a warning and been fined before for non-compliance with building regs!