I thought it was 1,600 for $20?
$80 (actually 4 purchases of MSP) x 1,600 MSP = 6,400 MSP
6,400 - (1,200 * 5) = 400 left after 5 purchases
But
$60 (3 purchases of MSP) x 1,600 MSP = 4,800 MSP
4,800 - (1,200 * 4) = 0 left after 4 purchases
So the people with B2K only save $10 vs. the people without it saving $30. Doesn't make sense. They could make it so it auto-detects if you have B2K and remove additional money from premium.