The movement of labour from regular workers to casual wage workers is known as the process of casualisation.
Casualisation is not preferred by the workers, even if it results in increasing their incomes because of the insecurity and social stigma attached to this concept.
A marginal farmer will not be happy to become a full-time agricultural labourer, even if he earns more, because being a farmer is much more prestigious than being an agricultural labourer.
Similarly working in a pharmaceutical company is considered prestigious than working as a daily wage labourer. So, this leads us to the conclusion that workers consider the work and income collectively and the nature of work gains precedent over income. Therefore, workers resist casualisation even if it results in increase in their income.