You're not buying toys — you're buying positions.

What it means

Every LEGO set in your inventory is a position in a ticker. Your job is portfolio management, not collecting. The math: $1,000 in → $3,500 net out, after eBay/Amazon fees, shipping, taxes, and storage opportunity cost. That's a 250% net ROI on the original principal, returned in roughly 24-36 months.

Why it matters

The single biggest mental shift the doctrine demands. Without it, you buy what you like instead of what pays. You hold too long on sentimental favorites. You refuse to sell when the target hits because 'it's almost worth more.' Numbers, not nostalgia.

In practice

• Every buy decision passes through the Stack Calculator first.
• Set target exit price at acquisition, not at maturity. Adjust only if the comp data warrants.
• When the Exit Coach says 'list now,' you list now. Don't get cute.

Examples

• $1,000 deployed across 4-6 carefully chosen sets → expected net $3,500 returned in 24-36 months → annualized ~50% IRR. Beats virtually every public market.