I will open a lending service on lending section of this forum.I know 40$ is little for this service.But I think it will grow up quickly and I will be able to make some good profit from this.And obviously,I won't give loan without sufficient collateral rather I will fill loan to trusted people only.
Lending is a good idea to scale up your money but its still risky.. and i think almost all ways had risky.
So for me i think better to test and learn if you experience that you are making good profit in lending well better to stay..
But if you are losing in lending due to some people are not paying and their collateral is not enough to cover your loses i think better to stop it and find other way to grow your money.. since he had $40/day so i think business is much better he can not make stable income daily but there is a possible that you can earn and get more profit.