That's funny... I have generally found the bi and poly people there to be most respectful and courtious! Perhaps there is something about your initial approach that they find off-putting... Like, if you lead with bull$#*! like, "hey baby, ur hot, wanna f*ck?" then of *course* you are going to be ignored / shot down... These are real women with real sensibilities, even if they are ultimately DTF...!

If you aren't answering many question or are ignoring your match %ages, then expect to be ignored ( or worse)!
I personally will not waste time on anybody with less than an 80% match or greater than 20% enemy with me, and that has made all the difference, I believe... *trust* the numbers!
But if you instead engage with them in a thoughtful manner about what they wrote about themselves in their profile, show that you actually are considering them as a unique and special human being, then I guarantee you that you will have luck on this site...!