The vast majority of users on this forum are using their fusion stones on recipes that can't possibly produce an epic
You're ignorant if you think that. The vast majority of forum users know what they are getting when using fusing stars for 50ep armors (why even include that). When people use 3* and 4* fodder in fusion, they are trying for epics. As for the + from fusion, even if it's a .000001%, there is bound to be someone on the game that would post it if they actually got it from fusion. Since there has been nothing but 'my brother/mother/father/great dead granddad' hearsays, it's pretty accurate to say it's impossible.