Inconsistancies for upgrading Relic armor!

[Ophannus]

Why do some jobs' relic armor only cost 20-25 piece of currency per piece to upgrade while some jobs relic armor costs 30 pieces to upgrade? I don't understand why it isn't the same for all jobs!
Saotome Kabuto+ 1: 24 20x 1 Byne Bills
Saotome Domaru +1: 22 20x 1 Byne Bills
Saotome Kote +1:20 20x 1 Byne Bills
Saotome Haidate +1: 20 20x 1 Byne Bills
Saotome Sune-Ate +1: 20x 1 Byne Bills

Compared to...

Wyrm Armet +1: 30x Ordelle Bronze Piece
Wyrm Mail+1: 30x Ordelle Bronze Piece
Wyrm Finger Gauntlets +1: 30x Ordelle Bronze Piece
Wyrm Brais +1: 30x Ordelle Bronze Piece
Wyrm Greaves +1: 30x Ordelle Bronze Piece

Why!?

[Atomic_Skull]

Why do some jobs' relic armor only cost 20-25 piece of currency per piece to upgrade while some jobs relic armor costs 30 pieces to upgrade? I don't understand why it isn't the same for all jobs!
Saotome Kabuto+ 1: 24 20x 1 Byne Bills
Saotome Domaru +1: 22 20x 1 Byne Bills
Saotome Kote +1:20 20x 1 Byne Bills
Saotome Haidate +1: 20 20x 1 Byne Bills
Saotome Sune-Ate +1: 20x 1 Byne Bills

Compared to...

Wyrm Armet +1: 30x Ordelle Bronze Piece
Wyrm Mail+1: 30x Ordelle Bronze Piece
Wyrm Finger Gauntlets +1: 30x Ordelle Bronze Piece
Wyrm Brais +1: 30x Ordelle Bronze Piece
Wyrm Greaves +1: 30x Ordelle Bronze Piece

Why!?

SE loves SAM and hates DRG.

[Ophannus]

Inconsistent for many other jobs as well though! I just want to know what their logic was..

[Leonlionheart]

suck (http://www.ffxiah.com/item/14511/sao-domaru-1) vs. amazing (http://www.ffxiah.com/item/14513/wym-mail-1)

makes sense

[Ophannus]

RDM and PLD is pretty good too and MNK, all cheaper than DRG DNC SCH etc