Durable member edge has shifted from headline sold price to the deeper structured layer (relisting chains, sub-market absorption, list-vs-sold spreads, off-market, ListTrac analytics)

Claim. Strategic implication of the post-2018 consumer-portal commoditisation: the durable member edge shifts to the deeper, structured layer — full field-level history, relisting chains, sub-market absorption, list-vs-sold spreads, off-market/exclusive activity, and showing-activity analytics (ListTrac) — which portals don't fully replicate.

Source. Synthesis grounded in HouseSigma — "first in Canada to make sold prices publicly available"; inflection point came shortly after the 2018 SCC-final outcome opening sold data on VOWs + Consumer portals commoditised the "just-sold" edge — practitioner consensus; portals cannot capture local nuances, off-market activity, or hold-offer strategies + TRREB / PropTx REALM — bundles ListTrac listing analytics, HoodQ 450+ GTA neighbourhood guides, SkySlope forms + ITSO Matrix — "more than 500 fields across property types, plus CMA tools, land registry data, neighbourhood insights, Authentisign, AnswerLink, and live market statistics" + RESO Data Dictionary 2.0 — 41 resources / 1,745 fields / 3,683 lookups (ratified Oct 23 2023; effective April 15 2024).

Confidence. Directional-speculative but supported by multiple convergent sources. Not a measured outcome — a strategic framing.

Caveats. Reasoning chain, not measurement. Treat as strategic hypothesis when used in articles; mark as "thesis" not "finding."

Implication / use. The Section 2 thesis statement and the Information-Asymmetry brief's seam. Cross-link with Research notes (capture-layer): the affirmative, inward decision-edge case for data intelligence — information asymmetry applied to pricing, demand, risk, retention, targeting (June 2026) — same pattern: portals commoditised the headline, the edge moves to the deeper observable.