Well, I've been fishing sharks, made about 6m so far. I like it, because I can do lots of other stuff, since barely any clicking is required.
Also, I can't say how I'm going to do it, otherwise prices will change, but 80 craft will cost me 1.44m, and 99 craft will cost me 12.56m! I ought to do these pretty soon, since craft is useful, and prices may change soon.