This is the question you should ask yourself from time to time. "What's motivation?"
I know it sounds like a cliche. Something an actor would ask of a director in order to better understand their character and why they're doing whatever it is they're doing. That's a different type of motivation, although it's akin to what we're talking about.
As a creator, you're going to be the director and the producer, and everything else that has to deal with the production of the comic. You're going to have to ask yourself what your motivation is when it comes to producing the comic.
Motivation cannot be fame or fortune. As a creator, fame and fortune more than likely will not be coming your way. For right now, your motivation should be producing the best story you possibly can.
What are the results of that? Hopefully, a good book. (Good, in this case, means a salable book. Even though there are books on shelves, both virtual and analog, does not mean the book is salable.) A salable book is almost always what you want the outcome to be. Even for experimental books/stories, salability is the goal.
The next thing, right after a salable book, is to break even. You're going to lose money on your first book. And your second. And possibly even your third. Losing money isn't the goal. Breaking even should be the goal (making a profit is nice, but most of you won't get that far for various reasons), but it's a long, hard road to get there.
Asking what's your motivation is a gut check, and it's something that you should do every so often. When you're having doubts, ask. When the light at the end seems far away, ask. If you aren't getting the recognition you think you deserve, ask.
When the answer becomes something else, that's when you have to start reassessing what you're doing.