So everytime I attack someone in pvp and win, I get maze or challenge coins (depending on the event). However if I attack someone on revenge and win, I do not get any coins (tried it 3 times in a row, no coins). I have this bug in the recent 72-hour challenge and also got it in the Primal Elements Maze. Are you counting revenge pvp attacks and normal pvp attacks as separate things? Please answer, because I can't really win normal battles because of lvl 130s (my highest monster is a lvl 115 Timerion)

I think your observations are correct:

• I don't remember to have received any coins from PvP revenges
• More significant: during the team race, only attacks, but not revenges did give a point
  (about this I'm very sure:-)