I have recently started using feedvalidator.org to validate my RSS feeds. The RSS reader reads the feeds fine but the feed validator says they are not valid feeds. I tried other RSS feeds like
http://feeds.nytimes.com/nyt/rss/HomePage http://feeds.latimes.com/latimes/news http://feeds.ign.com/ignfeeds/all/
All of these feeds are invalid according to feed validator. But, these are nytimes, latimes and ign we are talking about. Are they not considered about an invalid RSS feed? I tried searching for disadvantages of an invalid RSS feed but couldn't find much.