Yes, dabeaner Twitter does make me money. It really is a long story to explain how. There is no way I could teach you in a single response to your question.
I have in fact just two days ago began a blog that I hope to share with everyone who wishes to read it. The subject of the blog is Social Media Marketing.
The short answer to your question is simply "People do business with PEOPLE that they know, like and trust".
Twitter is one of the many social media outlets that I utilize to develop new relationships online. Many of the people I meet become friends. Working with each other and Masterminding (see Napoleon Hill, Think and Grow Rich) together we become better people.
It is a process, better people network better. Once that skill is strengthened you begin to understand marketing. I constantly learn each day and I am at the same time meeting amazing people. These people(who are some of the best people in the world) share freely.
Do they have products and services that they charge for? Sure they do. They are in business to make money.
No-one has ever become successful by themselves. You need to surround yourself in an environment that encourages your growth.
Twitter is just another of many tools that can be used to foster new relationships, grow as a person and grow your business all at the same time.
Twitter users at large have already started influencing television and radio. I cannot think of any Business that is not on Twitter.
You can ask anything you want to the entire world. Someone will answer if you can get them to hear your question.
I hope that answers your question. Indeed, Twitter makes me money but it is only one of many streams of education and networking that allows me to grow my business daily.