Imaro
Legend
Even when an ally makes a check the +3 bonus is only going to help within a narrow range: too high a roll and the inspiration wasn't needed and too low and the inspiration won't help. There's a 15% chance inspiration makes a difference on a d20 roll. There's not a 15% chance the barbarian's rage will affect a combat, or a 15% chance a rogue's sneak attack will prove useful.
Most of the time, the Help action will be more useful.
Huh? Inspiration isn't a set number... or are you taking the average... and if so are you just looking at bards in a certain level range because the die increases as they level up?