Top quality, professional resume writers earn very good money. Unfortunately, this is an area where many people without real skills proclaim themselves to be "professional resume writers" when they in fact are not. A true professional resume writer has very strong skills in sales and copywriting. Their sole purpose is to provide engaging writing that sells their client to prospective employers. Today's job market is fiercely competitive and people are willing to pay top dollar to have an edge in the market place.
Top resume writing professionals have demonstratable skills, keep up with current trends, and are masters at crafting words to sell in such a way that it doesn't come across as a sales pitch. There is a reason the good ones earn top dollar - it's not an easy job. People are entrusting you with the future of their professional careers and it is a writing field that requires patience, skills, and a dedication to helping others.
This is not a field you can learn instantly. It requires time, dedication, continual research and updating of your knowledge and skill base in addition to top of the line copywriting/marketing skills. If you are lacking in any of these areas you will need to get the proper training. Is it worth it? Considering top resume writers earn around $100 per hour - yes per hour, it can certainly be extremely lucrative. If you have impecable writing skills, are compassionate and are driven to help others succeed it can be a wonderful niche writing career.
You can learn more about becoming a certified professional resume writer at Certified Resume Writers or look at your local community college and see if they offer courses in resume writing and marketing. Top resume writers can make big bucks - if you think you have the desire and talent for it, consider investing in developing your skills. I would also suggest some course work in Human Resources. Knowing what the hiring departments are looking for is imperative and there is no better way to do that then to get some inside knowledge.