If you decide to work with an unregulated broker, you risk losing money.
When working with a regulated broker, clients are protected from fraud. Those investors who work with a regulated broker, in case of bankruptcy of a brokerage firm, may receive compensation. Also, such brokers are required to comply with all the rules of the regulatory organization.
Of course, this does not give a 100% guarantee against various kinds of troubles, but you are at least sure that your finances are in good hands.