Answer

First of all, habit. As for the issue itself, it is open to discussion. I write it with a vav, so it is not a sacred Name (at least in my opinion). In books (the later ones, after I realized this) I write it that way because “Elokim” in a book sounds awkward, and also sounds too religious and jars the secular eye. In ordinary writing I am undecided, since on the one hand there is no prohibition and no reason not to write what you mean. On the other hand, it seems to me like a good habit to be careful with the Name of God. There is also more room to analyze whether writing on a computer is considered writing the Name of God, and whether deleting it violates “You shall not do so to the Lord your God.”