When it comes to selling animal drops, and even hostile mob drops, it really isn't worth it. If you were to sell a full inventory of any cooked meat, you would only get $900! Same for the majority of mob drops. I do get the reason why they are lower than crops and other items; because you can get spawners for the animals and mobs, and in theory should be easier to farm. However at this price it really is not worth having spawners, not to mention that the majority of crops can be automatically farmed. It also changes the economy drastically; spawners are sold for $5000 at a time and don't really affect the gameplay because nobody needs or wants them, so the spawners are stuck in this vicious circle of being bought: people realising they are not worth having: then reselling them. All I'm saying is if the animal/mob drops sell prices were to match or be slightly less than the sell prices of the crops then we would see a wider range of farms on islands, and spawners won't be so useless. Feel free to give feed back.