Qustodian returns

Hello Hive account@qustodian, I don't understand your following calculation:

Daily ROI per SP delegated: 1.00%
Expected SBD per 1000 SP delegated: 0.253
Expected Return return on investment per SP delegated: 9.00%

1. If the daily ROI per SP delegated is 1% and 1000 SP are delegated then the return should be 10 SP a day or (assumed 0.4 SBD/STEEM) 4 SBD, since usually
   ROI = net income / investment.
   In your calculation it's 0.253 SBD

2. What is a 'Return return on investment' and how does 9% comes from?

Probably I have misunderstood something here...
Thank you 😊 Hive account@peekbit