Physical metal has to be somewhere, and the choice between a professional vault and the holder's own premises changes the risks, the costs and the ease of eventual sale.
Home storage removes intermediaries
Metal kept by the owner involves no custodian, no platform and no institution that could fail, restrict access or become subject to an order affecting client assets.
Access is immediate and unconditional, which is the entire point for holders whose reason for owning metal is independence from financial infrastructure.
It also leaves no external record of the holding beyond whatever the purchase generated, which some holders value and which complicates estate administration.
The risks it introduces are physical
Theft, fire and simple loss become the owner's problem, and household insurance policies commonly cap cover for precious metals at a low figure or exclude them.
Specialist cover exists but usually requires specified security arrangements and creates a documented record of what is held and where.
Concealment reduces the chance of loss but increases the chance that metal is never found by the people entitled to it.
Vaults provide verification as well as security
A professional vault holds metal under insurance, controlled access and periodic audit, and it produces records showing what is held and on whose behalf.
Those records are what make the holding easy to value, to insure and to transfer, because a third party is attesting to its existence.
Storage in an accredited facility also preserves the chain of custody, which matters for large bars because it avoids re-assay at the point of sale.
The exit is faster from a vault
Metal already inside the professional system can be sold and transferred by book entry, without shipping, inspection or the seller arranging transport.
Metal held at home must be brought to a dealer, verified and often insured in transit, all of which takes time and can reduce the price received.
That difference is invisible while the metal is simply being held and becomes significant at the moment a holder wants cash.
The choice often ends up being a split
Vaulting costs a recurring fee, which accumulates over long holding periods and is the main argument against it for smaller positions.
Home storage costs nothing recurring but concentrates physical risk and slows any eventual sale.
Many holders resolve this by keeping a small accessible quantity themselves and placing the bulk of the position in a vault, accepting different risks on each part.