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.