At a guess and without reviewing the video:

sell mundane runes, heartwood, etc for 4x (or more) the usual rates?

ditto with master writs?

ditto with xp boosters?

dump the event writs for next-to-nothing to promote sales of more furniture mats (except those 'easy' event writs which sell at premium)?

sell event styles for fat Aurum at start of event then buy them up at discount prices if/when they are ubiquitous by event end?

Did I miss anything?