I bet its not the quality of your comments rather than being flagged as spam by filters because of same ip,name or maybe link. To see whether this is true, add a couple of blogs you own (that have spam filter installed) at the end of the list. After it's done go and see if they were flagged or not and let us know as wellI post in chunks of 2000, about 1500 get posted and about 20 are accepted after i check. I don't know why, I guess my comments are bad or something. So, yeah, but approval rate is about 1%