Exporters may, of course, choose not to use that market and instead gamble that they might get a more favourable exchange rate at some stage in the future. They should be free to make that choice. But it is important to recognise that they are deliberately taking on foreign exchange risk in the hope of getting something better in the future.
They are not obliged to gamble in this way. This point is perhaps particularly relevant at the moment, when a number of farmers are lamenting the fact that, while the exchange rate is now much more attractive, that doesn’t help farmers because few have stock to sell at the moment.