I have gone through your website and found myself perfectly fitting for this task. I myself have developed multiple websites for clients and right now maintaining them. Apart from being a web developer, I possess great communication skills and analytical abilities to deliver you the best possible service. Maintaining website requires solving bugs, including new features as per required, constant focus on bettering its UI and UX, as the website is the mirror of any company.
I would love to take the opportunity for this, and yes of course, not over-charging. I believe if I make a good network and contacts with you and your company, it is more than the pay I get for the project. By the trust and my work, I definitely expect to become long-term developer for your company.
I would love to know more about this project and my work roles.