I like the idea of bad endings, I wouldn't even mind some with bad consequences. However, I'd prefer if the majority of bad endings had consequences that affect the main character more than the other characters.
EX: 1 major bad end for each girl (bad consequences; NTR, etc.),
2-3+ minor bad endings (small bad consequences; Not ending up with the girl, etc.)
Also a bad harem end like in Persona 5 would be pretty funny.