The scraper webmasters can speak for themselves. I certainly don't. I just refuse to bury by head in the sand and try to twist the facts to fit my opinions. The facts speak for themselves.
Every description of a scraper site that we have read in these forums applies equally to the "search engines". Can you name one that doesn't? And no, the robots.txt exclusion doesn't apply.
The scrapers typically don't even crawl individual websites. They crawl the Google SERPS, therefore the robots.txt exclusion isn't even an issue. By allowing Google to crawl your sites and extract snippets, you're making a decision to allow the use of those snippets by anyone or any bot that uses Google. You're in effect making snippets from your site open to the online world.
If it walk like a duck and quacks like a duck, it's a duck. Google, Yahoo and MSN do the walking and the quacking, therefore they are ducks (scraper sites). But they're scraper sites that I love because they help me make lots of money. The other scrapers can be banished to the pits of hell as far as I'm concerned because they do not help me make money. But they are no more scraper sites than the big three. Reality, plain and simple.