There's a lot of paid content on those two sites. Is that what you're referring to? If it is that's fine; just want to know whether it's worth paying for or not.
You'll eventually reach a point where it is not worthwhile for someone to tell you for the 47th time "You need a scalable method of attracting links to your website." and instead need to actually be able to plan and execute one.
* army bingo cards
* pizza bingo cards
* harry potter bingo cards
Generating such bingo cards and thus relevant pages is easy so even if no body ever searches for 'angry birds bingo cards' it hardly costs him anything to generate and host. But if someone does such a search, Patrick gets a free visit (which normally costs $1 or so in AdWords). Don't forget that a majority of search queries are unique and have never been done before so generating content automagically is a great way to do SEO.
I have a client project which blends linkable content and consumable content in an interesting fashion. I'll show you after it launches.
I would be very interested to learn once your client project launches. Good luck with that.