Actually... I like the blurred method for the scrapers.
Scrapers do get it all from what I see and include even the credit page but the main result is to support the places that aren't making money off of the work scanalators do.
At the same time, I prefer the blurred page on a scraper site since should things go bad and the manga taken off of a decent site, then the scrapers still have something that I can reference. I like to re-read manga, and often they aren't available to buy.