Gringotts vs Willy Wonka: how to read a LEGO investment projection without getting fooled

The Gringotts Wizarding Bank 76417 (already sold out in the US, still available for preorder in the UK) and the LEGO Ideas Willy Wonka 21360 are both nearing the end of their retail run. Investabrick assigns both high gain projections, driven in each case by the same logic: the cumulative value of their exclusive minifigures. Understanding this mechanic lets you judge whether the number holds up — or mostly captures current hype.

76417 — Gringotts Wizarding Bank

21360 — Willy Wonka

The two sets, side by side

Why the minifig, not the box, often drives the real value

On a licensed set, a significant share — sometimes the majority — of resale value doesn't come from the pieces but from exclusive minifigures, unavailable elsewhere once the set retires. That's the case for both sets here: $195 in cumulative value across Gringotts' 13 minifigs, and roughly two-thirds of Willy Wonka's sale price carried by its 9 minifigs. A minifig-based valuation method adds up each figure's individual value on the parted-out market to estimate a value floor, independent of the complete-box price.

How to read a projection without getting fooled

Three questions to ask before trusting a projected gain percentage:

• Is the sellout already confirmed, or only anticipated? Gringotts is already sold out in the US — a fact, not an assumption.
• Does the projection aggregate parted-out value (more stable) or complete sealed-set value (more volatile)?
• Is the 5-year horizon based on real license history, or a linear extrapolation of a 1-year gain?

My decision grid before investing in an EOL set

Before following a projection, I check three things in order: is the sellout confirmed on the primary market (not just a rumor), does minifig value represent a significant and verifiable share of the set's price, and is there a comparable precedent on the same license. Gringotts checks all three boxes. Willy Wonka checks the first two, but has no direct precedent on a Roald Dahl license at LEGO — hence no 5-year projection in the available data.

The takeaway

A projected gain percentage only has value if you understand what it aggregates. Here, both projections rest on a real mechanism — exclusive minifig value — rather than pure hype. Gringotts, with its already-confirmed sellout and richer license history, has the stronger case of the two at this stage. Willy Wonka remains promising but more speculative, lacking a direct precedent.