When your plant is getting tight in the pot (or when you purchase a plant like this one), you can easily get more plants by separating into more pots. This will allow room for your plants to grow, or is a great way to give some plants away as gifts.
You can get more bang for your buck when plant shopping too - find a plant that has grown and fills the entire pot and you can go home and divide!
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Division is an easy and inexpensive way to increase your houseplant stock. It's also a great way to "friend" plants to others, and a good method for rescuing and preserving plants that are showing obvious signs of decline.