Would you submit your paper that got rejected in a top-tier venue to a lower rank conference? My question is simple: If you have a paper that got rejected two or three times (border-line* rejects every time) from top-tier conferences, would you polish it and resubmit it again to similar or another high rank conference or would you try some lower rank venues ?

* Border-line reject: every time got 2 good reviews and 1 bad review.

P.S. Every time the paper got vague suggestions like: compare with this or that. And the first and second time we DID in fact address all concerns, but another concern showed up next time.

P.P.S. I am concerned with CS conferences.

Thank you.
I would not continue submitting the same paper to top-tier conferences after three rejections.  The Universe Has Spoken.  Move On.

Many of my colleagues do submit such papers to lower-tier conferences, but I usually just send my papers directly to journals after two conference rejections.