Get a farmer whose final trade is either wheat or wool (apples or meat work decently too). Bring an inventory of wheat and wool (maybe 60% wheat, 40% wool). Trade entire inventory for emeralds. There are many ways to make a lot of money with villagers, but that is a good safe one.
With the librarian, if the final trade unlocked is a profitable one, you can keep doing it until a good e-book trade is activated. I got 11 emeralds for a Silk Touch book, for example. If you can get a librarian who has Paper as his final trade (not easy), you can turn entire inventories of paper into emeralds while trying to activate a good ebook trade also. That is how you make it into a semi-sustainable activity. You will crash the emerald and e-book prices eventually though.
Butcher villager: you can do a similar thing with his Coal trade. If you get coal as the final trade unlocked (also not easy), you can trade entire inventories of Coal for emeralds. Having meat as the last trade unlocked works so-so as well.
I have no experience with the blacksmith villager, but I think the method is to keep breeding villagers until you get a blacksmith that trades Chainmail. Because his other trades are just expensive. If you spend a ton of money and unlock all his trades though, you can generate a lot of Chainmail, eventually.
Yup, takes a bit of luck, chance, and lot of preparation. And I believe that's one reason not many people do it. You buy 10 eggs for 10k and get like 4k out of it with a good run. It takes some learning to do
I think I made that up sort of here... http://www.ecocitycraft.com/forum/t...e-increase-for-vines.64384/page-2#post-307996
What makes it worse is that I've known about this for a while, I've spent around 25k attempting it three times, making very little profit. However, I do believe _TANS and believe he makes that much from them because I've seen him sell a double chest full of silk books.
Most of the money i've made from it is from turning wool/wheat into emeralds and selling the emeralds to shops. I can only do it for 10-20 minutes at a time due to too much clicking, and you tend to run out of wheat anyway. It is not like farming or mining where you can just do it all the time whenever you want. It is a supplement to your income.
Not many people do it because you have to drop a lot of cash at one point. You want to go and buy a stack of villager eggs, go through em one by one, you'll make a profit eventually.
Do you build structures in Minecraft? Or are you an architect in real life. I had always wanted to be an architect. Architecture is pretty cool.