Hi Minnowbooster Team -
Do you intend to allow a free market in the SP Delegation Marketplace? Hard coding the interest rates is very Keynesian and Central Bank-esque. Should we tune in to your monetary policy meetings and analyze your notes? :P Why not build out a bid/ask order book?
https://www.federalreserve.gov/monetarypolicy/fomccalendars.htm
Srsly tho, it'll be a good biz move on your part. Just take a cut like you currently do, which is the minimum that ppl can list for, and then allow the user to retain the rest %-wise.
Thanks for the great product and keep boosting!
-Ashe