If you are running a business without getting a trademark for it then you are inviting legal issues for the future. Not registering a trademark will leave your business open to lawsuits from those companies having registered their brand under your name, design, or slogan. You just need to submit the documents required for trademark registration for a partnership firm if you are running a business together with other brands. Not only will a trademark prevent another company to imitate your product or service but also protect it from others using your name. Don't you think it is a must tool for protection in billions of brands?