Helicopters are expensive and delicate machines requiring heavy maintenance, especially when flying in dusty conditions.

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And it is high maintenance, requiring frequent touch-ups and spot checks for smudging.

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Slow-growth shrubs are definitely low-maintenance plants, requiring less pruning and creating less yard waste.

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Really what it had offered investors what this cash-cow aspect, this large cash-earning and little-maintenance-capex-requiring asset class.

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Construction, maintenance and power transmission requirements will be much more costly than land-based installations, requiring even higher subsidies and consumer pain.

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