Interesting post. I read 90% of stuff on my flist (people posts, not comm posts). I skip only things like fanfic I am not interested in and mta for shows I know I won't have interest in (e.g. I know I don't like SGA so I won't read meta for it. But something I don't know anything about? yeah, will read). But that's how I find new things to watch/read.

I do cater a bit. E.g. I know a sizeable chunk of people on my lj like Bollywood, so even when I am in the throes of something else, I will be sure to post something Bollywood related. I don't think it's a hard thing to do as even when I am into e.g. Supernatural, I still like Bollywood and keep up with it etc. I do think in a lj you should post what appeals to you, generally.