I have to agree with shelley. It's very frustrating to read a post without punctuation.
I could care less if you capitalize, and I can look past the misspellings, but there is something about trying to read a post that is several sentences just jumbled together.
Another peeve is the people that refuse to use the "enter" key when they write long posts. It looks bad, and it's hard to follow.
There is nothing wrong with putting a few line breaks in a post to make it easier to read.
Most of the time I just skip those posts altogether. I think maybe the point is - if you are going to take the time to write something, take the time to make it easier for others to read and understand.