About business with blynk

I have an idea to use blynk for smart home business . Can I sell microcontrollers with blynk programm and suggest customers to set up blynk on their phones and do clone of my interface and purchase additional energy balance if it needs. Each of them will have their own Auth Token.

for that you need to just check the business site https://www.blynk.io/

You can. But for business, we have better options as @scropion86 mentioned.