My rant has been answered!
Yesterday, I ranted on Twitter regarding 9rules feeds. Every feeds that come from 9rules only have title without any excerpt about the post and it is sometimes a pain in the ass for lazy bum like me to open up the link from my RSS reader (especially when I am on iPhone) to view the article.
To my surprise, somebody from 9rules (Tyme White) actually picked up my twit and blogged about it with a reply to why 9rules does not enable summary for the feeds. The points that Tyme mentioned are logical but I still think it is a ploy by 9rules to get readers to actually visit the site instead of just browsing the articles with feed readers.
Regarding excerpt, site like mine offer full article via feeds (both image and text) so I do not think an excerpt is necessary.