I was thinking about the same while going through this thread. It is true that when you're inexperienced you can write excessive words or repeat ideas (I've made that mistake too), but I've also noticed that many webcomic readers are not looking for something deep to read. It might be a side effect of the medium (aka. the cell phone) and the fact that many people read on the go, turning reading webcomics into something where you only partially put your attention, unlike what happens when you have a paper book or comic, which is also something you probably paid money for, or had to go through the trouble of getting it from a library. My theory.
About the initial question, I don't mind long texts if it has a reason. I'm not only looking for pretty pictures in a comic.