Well, the step by step is to show how I work, although it doesn't belong in the same category as the finished piece because it is a WIP (work in progress). Since DevArt doesn't have a section for WIPs, I stuck in in tutorials. For some artists it can be helpful but for most it's just showing my steps to the finish piece. There are a lot of step by steps that are placed in the tutorial category and I would rather have it there than in scraps where no one will see it.
And a tutorial is to learnt to do that, I think, isn't it?