;TLDR
I skim. Sometimes on purpose, sometimes not.
If a question is posed in a thread in the first post, I will typically respond answering that question without reading the thread. Sometimes it could be 3 or 4 posts, sometimes 10 pages that I am behind.
Sometimes I skim because I am so far behind, and want to see what is going on right now. Like in an event thread, or in the Happy Thread when someone is saying Happy Monday, but it is actually Happy Friday.
Sometimes I skim because I am at work, and read too fast and miss things.
Sometimes I skim because I have 30 threads open at the same time, and am trying to pay attention to everything, everywhere, all at once.
I don't go into a thread and immediately intend to ignore all the responses. Sometimes in an AMA I want to ask a question and just rip to the bottom to ask it..... it happens ok.