Board Thread:Questions and Answers/@comment-27610972-20160307002654/@comment-24577221-20160319031120

BearDrummer wrote: Yes, the decorations are worth buying. They increase the amount of coins the monsters make, so they end up paying for themselves (and then make more). In this case, more and faster are the same thing. Decorations make you produce more coins per minute. This makes you collect coins faster. Decorations don't increase the amount of coins the monsters can hold, only the rate at which they make them. Whether this is useful depends on how quickly the monsters reach their limits and on how often you collect the coins from them.

The extreme example is the Potbelly, which reaches its coin limit in about 3 minutes if it's 100% happy, and 6 minutes if it's 0% happy. If you never collect coins from your Potbelly more frequently than every 6 minutes, making it happy won't increase the amount of coins you can collect from it.

At the other end of the scale is the Wubbox, which hits its coin limit in 24 hours if it's 100% happy, and 48 hours if it's 0% happy. If you're collecting coins more frequently than every 2 days, you get more coins if it's happy.

Other monsters are in between. The Strategy information on each monster's page in the wiki can help you decide if it's worth making it happy, and how much, depending on your own playing patterns.