Monthly and annual ROI from staking TRON - an estimation

I want to show a simple calculation for the monthly ROI and annual ROI
for staking 100 000 TRX in https://tronscan.org/#/
Price/TRX = $0.0266 ( as of today 17th April from CMC ). Lets assume that this price is fixed for this example.

Daily TRX that you will get for voting for TRON block producers is about 25 (estimate)
Investment required for 100 000 TRX : $0.0266 x 100 000 = $ 2660
Monthly income from staking TRX : 25 TRX/day x 30 days x $ 0.0266 = $ 19.95 ( about $ 20)
Monthly % ROI : (20 / 2660) x 100% =0.75%
APR (annual percentage of return) = 0.75 % x 12 = 9 %
9% return is far better than what some banks are offering. Moreover holding Tron also makes you eligible for Bittorrent monthly airdrop which is 0.11% of your TRON holding amount.
Hence you will gain in two ways : 9% annual ROI + BTT monthly airdrop.

Disclaimer : I am not a investment expert. The opinion and example expressed above is from my own experience and not to be taken as financial advice.