There's no metering (https://scrape.it/tour2) so you can create as many web scrapes as you want. Scrape.it constantly monitors each job to make sure the data extraction doesn't get interrupted when website changes. Should the website change, your jobs get updated automatically to continue working.
It's an impressive product, there's no doubt about it. I just happened to be looking for a WYSIWYG like tool for scraping a page for changes. This seems more like a commercial grade product than a home user hobby haha nice site btw!