If you put other components with a specific cost into your pouch, you are violating the VoP.
No, if you
accumulate wealth to buy or actually buy such components, you are violating the Vow. Storing spell components and foci is the normal use of a spell component pouch, regardless of value.
The VoP only allows the pouch and what came with it. You can't put other material goods with a specific cost into it, as carrying those material good would be breaking the vow of poverty, just as it would be breaking the VoP if you carried gold coins in that pouch.
No, that's incorrect. A spellpouch is purchased (or otherwise obtained) containing, and is assumed to be full of at all times with material components of negligible value outside of spellcasting. In that, it functions like a non-magical decanter of endless water- the caster need never replenish its cheaper contents despite the fact that those contents are being "annihilated by the spell energies in the casting process" (PHB p174) It does not come with components with a specific cost or divine foci because
those must be obtained seperately. You know- "batteries not included."
Basically, the spellpouch comes with spellcaster's basic box of legos. If he wants to do more with his legos, he has to acquire more legos from other sets. Most spellcasters simply pay money and get the legos they need, but the VoP spellcaster has no money with which to purchase anything of value. He will have to be content with his basic lego set until he finds more legos or someone gives him some more legos. If he somehow acquires an expensive set of legos, he may still use and carry it, but he may give those legos to someone else.
Or, to put it another way, my car comes with room for 4 passengers and their luggage. It does not come with those passengers or their luggage- those I must pick up along the way.
A spellcaster with a spell component pouch is assumed to have all the material components and focuses needed for spellcasting, except for those components that have a specific cost, divine focuses, and focuses that wouldn't fit in a pouch
(PHB p130, emphasis mine)
This just reinforces my point that the VoP is not supposed to be used 100% RAW- the DM is supposed to exercise a little common sense.
Ask yourself: Why would a god's servant, seemingly blessed beyond most other mortals (in a real sense, the D&D equivalent to a living saint),
be robbed of his ability to cast divine spells? Most Paladin spells and many Clerical spells require a divine focus, yet RAW, the VoP would prevent them from carrying it. Bless, something you think an Exalted Paladin or Cleric could cast, becomes unusable. Calm Emotions? Identify? Owl's Wisdom?
Protection From Evil? Raise Dead? Regenerate? Spiritual Weapon? The Summon Monster spells?
Sunburst? Tongues?- all are completely uncastable for a VoP PC in a campaign where the feat is used RAW. That, BTW, is NOT a complete list, and I didn't even touch the ones that get knocked off the Bard, Druid & Ranger spell lists.
And once again, re:the spellbook- its a 15gp item when aquired- its only value lies in the spells the PC writes in it. Its extremely odd to me that a VoP PC would have to give up his spellbook the instant he writes down a spell in it for future study and rememorization- odd enough to me that I would not make a VoP PC give it up.