I just got ducks, so I was checking the Wiki and I realized that unless you need feathers quickly for some reason, feeding banana bread to ducks is a really bad deal. The bread is worth 141 coins more than the best possible outcome in feathers. Where is the return on investment?

This is the first example I've found in fields/animals/factories, where the raw materials going in are worth more than the finished goods coming out. It seems an obvious bad deal.

The only other blatantly bad deal I've come across is the mob guy offering one measly t-cash for several bars of bullion. Using that bullion to upgrade trains and factories gets you to "Achievements" quicker and they pay lots of t-cash. It's a bad deal, just not as directly.

So, other bad deals us noobs need to watch out for?