While I think the crafting and barter system is good in the long run, over the pure-emerald system, I do miss the feeling of progression it gave. Plus, it makes basically every purchase just a cosmetic thing. Maybe making some girls give more valuable items, or more emeralds outright for the human characters would help this. Or, make it so that you can have multiple girls "running" at the same time, so each newly-purchased girl would increase your earnings, maybe only a fraction of what the main one would produce? And, if you made it so that the girls would cum faster or produce more if you equipped them with items they liked (like the nose ring for the cow) that would add more of a sense of progression to the accessories too.