I never notice it but looks like this tools like: http://www.wprssaggregator.com/extensions/ are a really big thing... Its not my main content but looks like this could help boost using a few feeds on a specific part of the website. Could i be penalized for using tools like this ? Even if i keep at the end: Source: url A lot of sites/blogs use this?
It really depends on what type of site....if you have a site where people come back because they like you or your style then I wouldn't use it but if is a niche site that you just need content for then I would try it...though I would rather just pay someone on iwriter...
Kinda expensive. Wouldn't this tool often post content from other websites on your blog? Duplicate content sucks for SEO.
If you have a text spinner with this plugins it would be great. But i am not sure they have it. If the text spinned and the articles are unique. It's a good idea. and easiest way to create contents to your site.