I have completed three MTA exams, including Software, Database Administration and Networking which now have allowed me to create my first major software. I am even headed in the direction of self-employment. Each MTA exam is relevant for my live video production software. I have written in C# WPF and I store important values like Chroma key settings in an MS SQL database. Additionally, I use UDP protocol for live streaming and knowing the OSI model now really helps.
Being able to use the same terminology as other professionals does boost one’s confidence. So if you are thinking about an MTA course, I say just do it. You will feel better for it.