Arbitao is not promising a high return on investment.

You didn't promise this?
Arbitao is a fully-working product, generating profits for the early investors
Then you don't need investors. You have fully working product which can give you 0.75% daily return. For what do you need $48,000,000?
Were talking 24/7, real-time analysis of 671 unique pairs on 10 exchanges to discover every profitable arbitrage opportunity and execute successful trades. Since May 16th, 2018 Arbitao executed more than 2.5 million arbitrage trades!

Have you already raised $15M?
If not, how you are operating on 10 exchanges?
Why do you need ICO if you have fully operating project working on 10 exchanges? Trades are in your dashboard, right?
The rate will not stay constant. At first, when we scale the operation, it will probably increase but as more and more competitors are joining the arbitrage market the price spreads will not be as high as nowadays. It may result over time in a drop of daily interest
What does it mean? If I invest $10000, I won't earn...

...up to $20500+ ?
What now? Can I earn 20500$ or not?

Look at us, we like to build pyramids, but that girl in the front (on the left side) forget how our logo looks like, but that is ok, it still looks like pyramid.