Okay so Thrawn wrote an interesting blog explaining why he doesn't just accept anyone into his friend's list. I ended up writing a long comment in response and then thought I could make a blog post out of it. Read what I had to say below.
"There's aboslutely nothing wrong with declining friend requests, especially with Microsoft having a 100 limit (I've been at that for years now!).
I too do get quite a lot of random friend requests and when they come without a message it's usually an automatic decline (unless I can be bothered to send a message back asking who they are and why they added me in case it's for boosting). The worst for me is on Youtube, I'm a unique skater and people seem to dig it on there so I get friend requests every other day from randomers I don't know, I have a message in my bio on there similar to yours.
Finally I think the friends list should be enhanced. I know it is going to be eventually but no word has been given (I believe) except that the total amount of friends allowed will rise. I am hoping for groupings to be created allowing you to split up your friends in to groups with "authority" levels granted on how they can access you. We all have family, friends and online friends but I also get random online people who seem cool add me and others that want to boost. The latter two would be added to my list just so they could see I'm online but features such as game invites, party invites and other features wouldn't be granted until/unless they get into my "authorised" list.
Now I've blabbed loads here and apologies for doing so, it's just a problem that bugs me."
Read his original posting here.