Writing is fun! But why? How can anything this frustrating also be enjoyable? It's that feeling of creating something magical out of nothing. Blank canvas or blank paper,when you create and construct an idea you didn't think you could, there's always a feeling of elation and accomplishment. What you compose may turn out totally different than what you started with. It's a journey, and it's interesting (and sometimes frustrating) to see what you end up with. Characters have a tendency to surprise you, and a new idea may send the plot in a new direction.
For example, in my current project I have a male character any girl would love to hate, but I realized through my critique group that he needs to be more well-rounded. I was really reluctant to give him more depth because, when I write him it's amusing to see how bad he can get. To create some tension, and to keep the reader guessing he needs to be nice though, sometimes.
I like giving myself time to write, and being able to act on an idea that's coming to the surface. When you have a family, it's important to have some "me" time, and writing is mine. I feel the time spent is also purposeful. Okay lets face it, I could be working out instead, I just choose not to. I am indulging myself, but why not, who knows what may come of it?