Financial experts are calling sugar "the white gold" these days. The prices are already sky high in international markets and are expected to go even higher.
Thinking of that, it makes sense from a business point of view by Sugar mills to raise the price because they could make lots of money by simply exporting the sugar rather than selling it to the government at lower prices.
Post#4 in this thread by bsobaid raises another important question. Please comment on that as well.