Just so I've got it all right in my head:
- BW cards have a limit of 50 transactions per day
- Supplementary cardholders are still subjected to the same 50 transaction limit as the primary cardholder, so additional cards on the same account will not provide any benefit
- Everyone in this thread who is doing this with multiple cards actually has multiple separate accounts, rather than just supplementary/additional cards on the same account
- Completely separate accounts are required for additional point gathering
- $2k/$4k can be transferred between whole separate accounts for the minimum deposit coverage
- Benefit to up/downgrading to/from platinum is... ?