Why might people choose to wear faux pearl necklaces as opposed to real ones?

There are several scenariOS in which people may choose to wear faux pearl necklaces instead of real ones. The main reason is the difference in price between the cost of real pearls and false pearls. For economy's sake, people may choose the latter option. Another reason would be dependent on the type of event one was wearing the pearls to. If one could be confident that under no circumstances were the pearls going to be at risk, then one would wear real pearls. If one is wearing a lot of make-up, it is advisable to wear faux pearls, the reason being that real pearls can be permanently stained by make up and completely ruined by perfume.