Now you finally have something to do with all those eggs your Goobers have been dropping when you fed them a delicious berry. Ok, so you've been able to sell those eggs for some time. But now you can hatch those eggs into a brand new Goober using the Egg Incubator machine!
Why would you want to create new Goobers? Don't those pesky things eat all your plants? Well yes, that's true. But Goobers can also be useful in many other ways. For instance you can Coop them up using the Coop machine and instead of devouring your plants, they will give you a shiny coin. Or maybe you have a terrarium where you are collecting every type of new Goober you find. Or maybe you have a hungry Eggler that eats other Goobers and you need to keep a fresh stock of food.
Not to mention Goobers aren't all bad. When you feed them until they POP you'll get a fresh Diamond out of em. So it's not too far fetched to want to set up an incubation terrarium. Spawn some Goobers. Then collect those Diamonds so you can unlock new items.
Let's See It In Action
In Conclusion
The addition of the Egg Incubator is yet another one of those things that gives the player a choice. Now you can sell your eggs, feed them to a carnivorous Goober, or clone them! This is your Gooberverse and the decision is yours.