Hiring a MacRuby developer can be beneficial due to their proficiency in this dynamic language, which integrates seamlessly with Mac OS X environments. They can create applications with native performance and appearance, utilizing the full power of the Objective-C runtime and Apple's core technologies. MacRuby developers have the ability to write cleaner, more maintainable code, and their understanding of Ruby and Cocoa makes them versatile. They can build both desktop applications and server-side technologies, offering comprehensive solutions. Their unique skills can potentially speed up development, reduce costs, and enhance the quality of your software.