Yes you can start mpesa business with less money . However,Be ready to receive between 500 – 3000/= commission per month.
You will receive endless calls from dealer/agent to increase your float who will later replace/swap the till because low float.Bank or super agents charges for buying float or cash will reduce the 20k.
The standard float requirements according to safaricom is 35k minimum float .The secrete with mpesa is transacting huge values,,, did you know you can you can get 30k commission with only 10 transactions daily? Get 10 customers who can deposit/withdrew 50k to 70k daily then you will pocket 30k per month.