My banks interest rate is 0.6% P.A
Heat is 5% per month.
If the tech is good and you are holding 50,000 heat,
You are making around 2,500 heat per month,
That is 30,000 Heat per year ( estimation, i can't be bothered to do the compound interest calculation, this figure is actually slightly higher).

Lets say - and i know it sounds farfetched at the moment,
but lets imagine that Heat pulls it off & its market cap reaches 50 Million,
a) your $2600 stake is now worth 1 million dollars
b) after forging in year one,  you are making about $50,000 a month or $600,000 a year

Your overall Heat net worth from a small $2600 stake at the moment, after year one is worth about $1.6 million

We can even be more realistic and say that Heat achieves Waves market cap around $25million
That is still $800,000, from a $2600 stake at the moment + forging for one year.

The maths does look good.