90% of the users do not read before writing. If you do, you will get many merits and will be considered a good poster.
I would say 60 -70 % dont read before they write something .
I recommend that you just ignore any thread with more than 15 replies.
After 15 replies, most of the time, everything was already said and spammers join in
Depends realy on what board you are and specialy on the Altcoin board you are right as long the thread owner is active with what they doing ( But there are not much).
The most just read the First post mostly or the first lines on it if the post is longer.
At the other side if there are more replys on a thread specialy that one that the OP have posted they share all there view and a few of them there Experience.