As you can see, consultants are paid to gather input (data, information) and produce output (knowledge, wisdom). That's their process. It's the same broad process whether the consultant is an immigration consultant or a voice trainer. So why don't prospective clients simply gather the education and data to do the job themselves?
Many do. For simpler problems, many people do the research and make their own decision without outside help. Others ask trusted advisors who don't charge a fee, such as a reputable salesperson. Still others simply ignore the problem. Many people can solve their own problems without help, though not efficiently nor completely.
That's where consultants come in. That's you. Your service will be to help others clearly define specific problems and offer well-considered solutions that are valuable. You are adding value. The greater the value you add, the more successful you will be and the greater will be your rewards.
For example, senior citizens can take the time and effort to learn how to invest their money without paid consultants. Millions of them do it every day. Why do they need an investment advisor? It will be your job to help them understand why. For example:
You can increase returns by knowing when to invest, based on experience.
You can help clients find little-known investment opportunities.
You can help reduce taxation with your unique knowledge of tax shelters.
Your fees are based on results.
Your specialized training reduces the risks of investment loss.
The list can go on. Each of these points adds value to your service over clients doing it themselves. People don't mind paying for services if the perceived value is greater than the price.