It brings the story to attention, just like HN does. TC does it with link + headline + text + discussion. HN does link + headline + discussion. I don't see a problem with that.
They're a news aggregator; there's no reason to post this article here. If they had additional commentary, then there might be. Like the guidelines (http://ycombinator.com/newsguidelines.html) say, "Please submit the original source. If a blog post reports on something they found on another site, submit the latter".
Not really. TechCrunch is in my Rss reader; Woot is not. Most blogspam is on little unheard-of blogs to make a few bucks on ad revenue from that particular post; TechCrunch serves as an aggregator, kind of like HN.
The difference to me is that HN doesn't reproduce the content of the source - interesting discussion here tends to drive me to the source site, giving them the benefit. TC gives enough info and commentary in their summary that I rarely go to the source, robbing them (in a way of speaking) of my eyes.
Sometimes they quote/summarize too much rather than directing you to the source, I'll grant you that, but as a website TC still has its place. If I want information about who's getting funded/doing what, that's where I go. I don't think it should cease to exist.
But I agree with you that aggregators shouldn't link to sites like TC, but rather the original source.
Edit: Why the down-votes?