Why energy conservation techniques should be adopted in transformers even though its efficiency is 90%?

Why energy conservation techniques should be adopted in transformers even though its efficiency is 90%? 
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Reason for energy conservation techniques should be adopted in transformers even though its efficiency is 90% :

Transformer performance depends on its efficiency. Transformers used in real-time applications suffer from load as well as no load losses. Loss of efficiency reduces transformer performance. Hence, customers should try different types of methods to improve the efficiency of the transformer. Since transformer is almost connected in circuit for 24hrs. Continuously so it is necessary to reduce the losses. By different techniques it is possible to improve the efficiency of the transformer more than 90% as there are no mechanical losses.

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