I wouldn't agree with Venom Spit as that is caused by a close brawl that goes down to the wire, in those situations I believe that only one person should gain from it (the person who got the kill in first), it encourages people to be clever and to think carefully about pressing the attack and not overextending themselves.
On the other hand, with regards to mines and poisoned potions I do think that money and xp should be applied during the death period, as you have no say over when they will go off and it's just dumb luck if you don't get a reward if they are triggered due todying to something completely unrelated across the map.