I'm fine with selling it as an item since they can be bought, custom boons could be sold at the level you receive it at.So, this passed a month ago and I lost track of it. One thing we missed - what happens if someone has a boon and chooses to replace it?
Can they sell it like a magical item of its level or do they just lose it?
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Too many boons hurts the character item limit balance. For example, there's a boon that exactly mimics one of the best heroic foot-slot items (Boots of the Fencing Master) but doesn't take up the foot slot.
Judges?
And what is the problem in this? Wonderous are also slot-less. Do they have to be limited, too?That's why I think it would make sense if they were. Someone making a paragon character could easily have 3-4 cheap boons. At epic, you could easily have 10-12 for the price of a mid-paragon item.
Hope this isn't already decided...
The item limit balance is the cost. Does your mentioned boon has the same level as the item?
For slots, everyone can carry duplicate utility items or even weapons around. He just cannot use them all at once. Many boons are just utility things that give great flavor but less game benefit (speaking with animals or use a hare as a horse in the feywild book, for example).
Why reduce this?
And what is the problem in this? Wonderous are also slot-less. Do they have to be limited, too?
Was there any problem with alternative rewards that needs to be fixed this far besides of the mentioned item/boon in the first post?
If not, just disallow this one boon instead limiting players to choose between great game effect and great flavor boons.
boons can be sold as any other item. If a custom boon, their level is the level the character gained the item at.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.