The simple answer to this question is that it should be good for your business. In many cases, registering your trademark is a cost-effective way to:

A) Stay out of trouble
You don't want to risk having to change your name later on. Name changes are one of the most painful processes a company can go through. If you are infringing on another similar trademark, now or in the future, you may be forced to change your name and pay for damages and lawyer fees.

B) Protect your business
Without a trademark registration, you run the risk that a competitor starts doing business under a similar name, "stealing" your customers or confusing them. This can be very damaging for your business.

C) Create value
When you register a trademark, you are protecting something that has the potential to become valuable. A trademark is an intellectual property that, when used and renewed every ten years, has an indefinite lifetime. By protecting it, you are adding to the value of your business.

Strictly speaking, if your brand becomes known without a trademark registration, you have trademark protection anyway. The problem is that you will have the burden of proving that you were known in the customer group before the other similar, registered trademark. This may be a lot harder than it seems. The trademark registration is an easy way to prove that you were first and have exclusive rights.