2k Bullion is required for each BPN (our unique version of MN).
There is a cap of 125 BPNs (250k Bullion), which is about 25% of total supply.
Interest is projected at 6-18% per year, depending on how many of the BPN spots are full at that current time.
All additional potential BPN owners would enter into a queue and wait for a BPN to open up. During queue one would still earn interest, however it would be at the PoSP interest rate (2-6% annual estimated once BPNs are live)