dags, Linda, don't get me started on the few bugs. I've had a couple of chapters that I could've sworn I fixed, only to read the first review and realising it didn't "save" my corrections/changes ...
dags, I don't republish, I simply start another book. And like you, I have to say, also not the best way of doing it, but it works best for me.
Although ... I was mostly referring to the actual reviewing process and not so much the site, but we can discuss both! 
The only reason I can think of why it's easier to write all new stuff than fix my older writing is that I have learned so bloody much from everyone on this site, that my more recent "first draft" writing is much, much better than my "first draft" writing from many moons ago. It's really time consuming to fix all those beginner mistakes, let me tell ya!
I'm almost done with fixing the first draft ... That's the good news. The bad news is ... I stopped roughly 30-35% into my first draft and started again - too many massive plot changes. The good news is, so far so good, no more massive plot holes so it won't be long now, and the first draft will be as good as done. 