Example: Chewbacca has a portfolio value of $10,500. And gets out a margin loan of $24,500. (70% LVR) This gives him a regular buffer of 10%. If Chewy were then to buy another $5,000 worth of shares a couple of months down the track, bringing his portfolio value up to $40,000. ($15,500 his own equity and $24,500 margin loan) Would this bring his LVR down, and give him a bigger buffer?