it can be very very hard not to vote for 'friends' - but I look at it this way, there are some people here on steemit that started the same time as me, or helped me out when I was new, and before the delegation I voted for them. I continued to vote for them after the delegation as I dont see why I should 'stop' because I was given power. Many of these would also vote for me. Some would call this a voting circle.
What I noticed from mine is that I did not vote enough for the people that delegated to me and I should have shown my gratitude to them that way. So I can only hope that they are happy with the reach I did achieve
I realized i did the same, it was a total oversight from my part, it was like a kind of tunnel vision so concentrated in to using it properly and failing at supporting the source.