I see one-paragraph questions (normally asked by new users) around here all the time. To be clear, I'm not talking about one short paragraph like here. I'm talking about one huge paragraph that could easily be split up into two or three paragraphs.
Questions asked like this normally don't get any attention, because the first thing you see is this monstrous block of words jumping right into your face. How about putting a length-restriction on a single paragraph?
Example (860 characters)
This is a going to be a very long, single paragraph. I do not include any sub-paragraphs because that would make this whole thing actually readable and nobody wants that. Actually, this example is a little unrealistic, as I'm using punctuation and switch between upper/lower case letters. sometimes i see questions being asked like this where nobody uses comas or dots this normally ends in sentences not making any sense the people which are doing this should be hanged. Normally, even these huge things are structured into "This is what I have", "This is what I need", "This is what I tried". It would just be too easy to make all those three parts of the question into separate paragraphs, because that would allow to simply skim the question and make up your mind about whether this is interesting enough that you want to put time into answering it or not.
It's not at all possible to skim through this big pile of characters without reading the whole thing (be honest with yourself: you didn't read it either :). I then normally move along without any further interaction.
Now, only allowing around 200-300 characters per paragraph would force people to think about proper sentences. It doesn't hurt anyone to hit return every once in a while.