I'm a finisher. When I start a quilt, my interest is in working on that quilt, not starting another. Occasionally (like now) I have several completed tops to be quilted, but they will all be quilted in a reasonable time. That's just my nature. The only exception is when I take a class to learn a new technique, and after the class I decide that I don't want to continue with that technique. That project may never be finished, but it wasn't started as a quilt; it was started as a learning exercise, and in that sense it is finished.
The downside of this is that I have trouble deciding what to make next, since once I start I will be committed to finishing. Starting has always been much harder for me than finishing.
I think there is a big difference between the person who has 10 projects going at once, but who finishes all 10, and the person who seldom finishes anything, but keeps starting new projects. Still, if both people are happy with their hobby then all is good.