Has anyone tried the following trick to maximize tiered airline rewards:

Maintain two separate accounts between husband and wife, one in which points are actually accrued ("Account A") and one which holds only a nominal amount of points ("Account B"). When it comes time to redeem for a flight that prices out to, say, $401, transfer points from Account A into Account B so that Account B has exactly 20k points. Then, book the ticket through account B paying exactly 20k points plus the $1 difference.

Seems like a great way to maximize value. Only downside is that if you're booking 2 $401 tickets, they would likely have to be purchased in separate transactions, so that Account B has only exactly 20k points for each transaction.

Anyone have any real world experience with this?