For most folks doing things gradually keeps risk closer to their tolerance.  You don't want to be chasing it up in the FOMO frenzy, so starting to nibble a bit early, and patiently enduring a tolerable drawdown should one occur, means you at least have some skin in if the correction takes you by surprise.  I think we are about half the fundamental PQ=MV price right now, so a correction seems inevitable, eventually, unless the dnm economy suddenly contracts to match.  I allocate a % of powder to limit bids increasing in size all down the book, and a % of disposable income to periodic buys, under such circumstances.  But yeah, the staircase has not confirmedly reversed yet.