Have you ever noticed here and/or at other sites, you can go X amount of time with no reps [good, bad or neutral] then all of a sudden you get many, be it for one post or lots of different posts? That happens a lot with me. It doesn't matter if they are good or bad. I tend to get a group of them, but not always for the same post, then I don't get any at all for ages. Maybe it's like a chain reaction, someone 'spreads the love' which inspires the recipiant to do the same. And that's that.