It might be a sense of contributing to development of your society. Every brick you make is a significant visible improvement for everyone there. But on Earth,

It might be a sense of contributing to development of your society. Every brick you make is a significant visible improvement for everyone there. But on Earth, a lifetime's work is nothing compared to the whole world's output. You can't see if you're improving things, making things worse, or having no effect at all. If you do simple things like make bricks on Earth, they probably have negative value - somebody will have to do more work to break or discard them soon enough.