How many people even HAVE 3x of the same bulletin?
Most of people who have 1000+ hours in the game, like I personally could full stack about 60-70% of all bulletins in the game, even if doesn't make sense for most of them.
who actually got their arse beat because someone went 3x of same bulletin?
It isn't something horrible game breaking or horribly unbalanced, but there is difference for paying for 1 shrek or paying same price for shrek and half of mine/nade or free infiltration nades, there is difference in having 76% or 66% chance to penetrate the same tank, yes its still RNG, but +10% to deflect its very good bonus.