There is a big injustice with those referral programs. Let us explain the situation!
The first person (let's say, John), advises Paula. Paula advises Robert and Paul, and they advise several other people and this goes on. Can you imagine? It's like a snowball that starts a big avalanche.
In this example, John adds tens of thousands of new customers but earns maybe 20-30 dollars. Yes, he doesn't spend so much time, energy, etc., and you can think a 20-30 dollars payment is enough for 15-20 seconds. But also you have to consider that, he turns great potential energy into kinetic energy of tens of thousands of new customers.
If you agree that there is an injustice & John must be rewarded more!