Why should you create better graphics?
I've seen some of the earlier episodes but couldn't continue because of the graphics. Your story may be good (as you mentioned it) but without good graphics it's hard to watch.
So, should you create better graphics? Because graphics contributes to the presentation. Would you go to Britney Spears's concert (I don't know if you like her, but for the sake of argument, let's assume you do like Britney) where she just stands there and sings her songs? If she is standing there, then why bother going to the show? You could just listen to the CD. I come to NG (as well as many other users) because I want to see graphics that goes well with the content. If I want a good story, I read a book.
You could get a lot more fans if you put more effort into your work. A lot of fans! If you don't have time, maybe you could team up with a few animators from NG.
Hope this helps.