Collecting Bad/Dead Ends has its own rewards~ with the Taiga Dojo stamps, if you unlock them all you get a hidden Taiga Dojo scene that is much longer than all the rest~ Honestly Stamp bad end #13 is the hardest to get in the game in my opinion, took me so long to figure it out~ xD (I was going to 100% game without looking up walkthroughs :( ) That one seriously took me like 2 days to figure out~ xD
Edit: Ah that sucks Slayn, nothing you can do about it?
Edit2: Fun fact, in Carnival Phantasm when the Neko's are playing Fate/Stay Night game the ending they got in that scene is actually Taiga Dojo stamp #13 bad end~ xD