Large pots over 30cm inevitably result in fewer productions. The reason is the scramble for a place when filling the kiln. Large items, especially bowls, take up a lot of space, so it is often the case that only a few pieces can be produced in one kiln firing. Or some writers don't make it at all.
Fans may be the best category to aim for, as you will inevitably be able to get a piece with a high value as a one-of-a-kind item. The shakubachi is a dish that combines versatility and rarity that can be used every day.