I never said they are worth the price tag. As a matter of fact, they are deffinently NOT worth their price tag, and I mentioned that earlier. And I know the point Baj is trying to make.
I just said that Spharai in itself is relatively useful compared to other jobs. No, it doesn't give the same boost that Apocalypse give to DRK, but it doesn't have to in order to be usefull due to MNK's nature. Baj (or someone) mentioned that Spharai fails due to Spharai not having 6% critical hit chance increase. But Spharai have something better, a 5% tripple damage hidden effect, which can procc for both fists. Spharai in itself is more useful then a lot of relics, such as Mjollnir and Claustrum that are extremely situational. It doesn't boost MNK as much as Mandau boosts THF, but once again, it doesn't have to.
No, it doesn't come close to Gjallhorn or Aegis, but those are, like you said, unique. It do however hold its own against Mandau, Apocalypse etc. And guess what? they are completely different weapons. Imagine that, different weapons for different jobs giving different boosts, such as the Perdu weapons.
Gjallhorn is utterly useless when looking at casting Minuet, Madrigal etc. since it gives a +2 per song, just like most other instruments do. The only thing it matters for us Ballad really, which is why it shines. The only other reason it shines is because of the +5 sing/wins skill, and the fact that you can finally sell your other instruments.