If you aren't a scam then describe what the hell will you do with the XRB and you will earn your clients 10%/5 days. That's actually 2%/day and a wooping 600%+ per anum.
You are forgetting about compound interest.
I could invest $10 and get $11 back in 5 days. I could reinvest that $11 and repeat that 73 times in one year.
1.1 (10%) to the power of 73 is actually
1,051% interest per year.
Obviously a ponzi.