The transcript is the long tail of every live event
The live audience for an event is bounded — the people who showed up. The transcript audience is unbounded. Every search query that matches a phrase in the transcript adds a new viewer at no marginal cost. Over months, transcripts often deliver more attention than the live event did.
For events you publish publicly, that long tail compounds: every transcript becomes a search-engine-indexable page that ranks for the long-tail queries the talk covered. A 50-minute conference talk can rank for hundreds of queries that were never the talk's title.