that was my initial thought too - but the boons don't seem to boost you that much. i've been using un-upgraded weapons and they don't seem to be leveling any faster than normal.
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I played pvp with a friend last night who had a level 11 character. End of the night he was level 40. Boon was good for him
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Yeah you are right, I haven't seen a big difference in gains and I have all 5.
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I can confirm that the infections give you 37.48% extra XP, it makes no difference if you have 1 or 5. also, Focused Light stacks with the infection buff giving you 100.16% extra, basically Double XP.