Doctrine Filter / Buy Score Engine

What it does

The brain behind every recommendation. Every LEGO set in the catalog is scored against all 13 doctrine pillars: lane match, minifig exclusivity, retirement window, MSRP-vs-clearance entry signal, auxiliary appeal, audience strength, projected ROI on margin-stacked basis, and more. Each pillar contributes a weighted sub-score. The composite is a single MMA Score (0-100).

Why it matters

Members shouldn't have to memorize 13 pillars to make a buy decision. The Doctrine Filter does that work for them, transparently. Every score shows its breakdown — which pillars contributed and why — so members are *learning the doctrine through use*. The course teaches it explicitly; the Filter reinforces it every day.

Core features

• Composite MMA Score (0-100) per set
• Pillar-by-pillar breakdown ('Why this score?')
• Filterable catalog: 'show me sets scoring 70+ retiring in 90 days'
• Personalized weighting (advanced users can tune their own conviction)
• Score history: see how a set's MMA Score has changed over time
• Cross-referenced with Portfolio: 'sets you own that have updated scores'

Example flow

1. Member opens the catalog filter: 'Score ≥ 75, retiring in <90 days, under $200'
2. 5 sets surfaced
3. Member taps one → MMA Score 82/100
4. Breakdown: Lane match +18, Exclusive minifig +12, Retirement signal +20, Auxiliary appeal +14, Audience score +10, Stack potential +8
5. Member adds to watchlist + sets price alert

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