It IS an old post, but as its author, I'll answer. Because the Mackie stand doesn't allow for some of the creature comforts of having outboard gear that I use a lot that close to mix position, doesn't provide a rest for my monitors (mine are not embedded into my walls), or provide valuable space for other things I like to have right at hand. I felt I needed a little more functionality for my tastes (and everyone's are different) and so built this exactly to what I wanted for not a lot of money...labor was the biggest expenditure.