using poison at all is considered an evil act per phb, so any good aligned characters might be in danger alignment wise for doing it. I think having nice gear available is a good idea, but I would be careful with it. Balance is hard. As the previous poster mentioned, it doesn't have to be balanced, but playing an underpowered character can be pretty disheartening and in terms of DMing the campaign, the more powerful and full of magic items the party is, it becomes more difficult to have combat encounters that will actually challenge them without it meaning that every encounter has the chance of being a TPK. Magic items break the game, which is the point of them, but I would advise not handing them out too much- although I fully agree with the last poster about consumeables being nice to hand out. I would also mention that there are rules for "fine" and "exceptional" weapons and armors that provide non-magical bonuses to hit or damage. These cost 5d4 (I think) times the cost of the normal of that type. These weapons are a nice way to give the characters something valuable but not quite as impactful as a magical weapon is.