It's probably because I'm still busily trying to build a fantasy world, but I've developed a serious pet peeve regarding ill-thought out worlds and worlds that develop holes for no good reason. Now, some worlds are infamous for their world building holes (the world of the Inheritance series, for example), but even J K Rowling was poking holes in her world by the last book. Is it really that hard to create a coherent world? Do no authors make use of proof readers, professional or otherwise? How do you write something that clashes with your world as established and not notice on editing? More importantly, how do I not make this mistake?
I don't want my readers to walk away wondering how wizards, or possibly house elves, buy groceries. I don't want them questioning how my created societies work. I don't want them questioning whether the bad guys are actually bad, unless, of course, they're supposed to. I don't want to present unintentional hypocrisies. I don't want a world based on stupidity any more than I want to write plots based on stupidity.
I'm sure all writers feel the same way, or at least I hope they do. Which means I'm probably doomed to make stupid mistakes, too. *sigh* Darn it.