Please note: This LJ is for the most part friends-only now. If you wish to be a part of it, please leave a comment in one of the open entries. [And I do believe there are more than enough public entries around these parts of LJ]
I'll gladly consider adding you to my f-list. But please understand that if you have very few comments posted despite being on LJ for quite some time or if you have very few friends despite being a member of many communities I may not friend you back. It's just that I want to communicate with the people on my flist and the beforementioned things are definetly signs that you're not interested in that. If I haven't friended you back after a month or so, I'm likely not going to, so you may want to take me off your list as well.
And if you really need to know why I ask for a comment: I'm not checking my profile every day to see who's friended me and forgot to say so. Imagine my surprise when I see a whole bunch of you listed.
If I took you off my list, it's not an insult by any means; it just means that I haven't found a basis to communicate with you. Or I found you hot-linking images of mine.