Deciding how to hold precious metals involves several separate questions.
Proportion
Typically discussed as a small percentage of a portfolio.
Which reflects the absence of income.
Vehicle
Physical, funds, or mining equities.
Which are different exposures with different risks.
Rebalancing
Restoring the target weight periodically.
Which enforces selling into strength.
Costs
Storage, spreads and fund charges reducing returns.
Which compound over time.
The costs that determine the outcome
Physical holdings carry premium, spread and storage. Funds carry annual charges. Mining equities carry company risk and equity volatility.
Which means the vehicle choice affects the return as much as the metal price does over long periods.
None of these is free, and a small allocation held for decades can lose a meaningful proportion of its value to costs alone if the vehicle is chosen carelessly.
Why allocations are usually small
An asset producing no income.
Which limits its role in a portfolio.
Rebalancing discipline
Selling after strong runs.
Which is psychologically difficult.
Holding period
Costs mattering more the longer the horizon.
A general note
This describes considerations rather than recommending an allocation.
Why this sector attracts so much bad information
Precious metals sit at the intersection of a genuine asset class, a physical product with wide retail margins, and a set of narratives about currency collapse and financial crisis that sell extremely well.
That combination produces an unusual amount of marketing dressed as analysis. The metal itself is a legitimate holding with a long history; a great deal of what is written about it is produced by people selling it, and the two are difficult to separate if you are reading only the material that finds you.
The questions worth asking before buying anything
What is the premium over spot, what will a dealer pay to buy it back, what exactly do I own if this is a storage or digital product, who holds it, is it allocated to me specifically, and what happens if the provider fails.
Those six questions dispose of most of the problems in this sector. They are all answerable before purchase, and a seller who cannot answer them clearly has told you something useful.
The gap between spot and reality
Almost everything that goes wrong for retail buyers comes down to the distance between the price quoted on a screen and the price at which an individual can actually buy and then sell.
That gap is made up of fabrication cost, distribution, dealer margin, sales tax where it applies, storage where needed, and the spread when selling back. None of it is hidden, all of it is checkable in advance, and almost nobody checks it.
A general note
Nothing here is investment advice. Tax treatment, regulation, consumer protection and dealer practice differ substantially between countries. Anything with money attached warrants checking against the rules where you are.
What the evidence actually supports
Low correlation with equities over long periods, which is a diversification argument. Not a reliable short-run inflation hedge, despite the reputation. Not a consistent crisis performer, despite the narrative. No income, so returns depend entirely on price movement.
That is a defensible case for a modest allocation and a considerably weaker case than the marketing makes. The difference between the two is where most retail disappointment in this sector originates, and it is entirely avoidable by reading the research rather than the advertising.
Where the reliable information is
Industry councils publish quarterly demand and supply data, free. Exchanges and benchmark administrators publish prices and methodology. Regulators publish warnings about specific firms and practices. Refiner accreditation lists are maintained publicly and are searchable.
All of that is dry, none of it is promoted, and it is the material that actually describes the market rather than the material trying to sell you part of it.
A closing observation
Gold has been held as a store of value for a very long time, and there are reasonable arguments for a modest allocation in a diversified portfolio. Those arguments do not require any claims about imminent currency collapse.
Material that leans heavily on such claims is almost always selling something at a premium, and separating the asset from the narrative around it is most of what a buyer in this sector actually needs to do.
One last practical point
Before buying physical metal, get a buyback quote from the dealer for the exact product you are considering. That single question tells you the round trip cost immediately.
A dealer who will not quote one, or whose buyback is far below spot, has answered a different and equally useful question about whether to buy from them at all.
Further reading
Industry bodies publish demand, supply and price data quarterly and free. Financial regulators publish warnings about firms and practices in this sector. Both are more useful than the commentary that dominates search results, and neither has anything to sell.