Well, duh, you say. Or else everyone would have a best-seller. Or then, maybe no one would, because there'd be no exceptional books to stand out from the rest. It's a good thing. But it's draining as a writer.
Sometimes, stories or scenes spill from my fingers through the magic of my keyboard like a full-fledged concerto, composed by a brilliant composer (not so brilliant in my case), but other times the words just get stuck. Plot holes develop with bottomless pits that I can't escape.
I get a (what I think is) brilliant idea for a plot development, only to realize that it just won't work with the current characters' back story or how I want the ending to play out. So, I keep re-thinking, re-writing, re-drafting, jotting indecipherable notes in my notebook in front of me, scratching most of those out when I realize they won't work either.
It's enough to make me want to take a nap. But then I can't, because I have three kids, and they have to be fed at least every other day. (That was a joke.)
The point is, well, writing is hard. It's fun, it's rewarding, it's my therapy, but when it gets down to it, it's work. Let me clarify. Writing something others actually want to read is work. Is it worth it? Only the writer can be the judge of that. If you think only in terms of income, probably not, since very few of us can actually make our living from writing (at least where fiction is concerned). From the aspect of accomplishing a huge task forged from our own imagination and hours of research, planning, and editing, something we can look back at and say, "Yeah, I did that," then yes, it is worth it.
What makes writing worthwhile for you?