Yes the developers are saying that 10% will be your profit if you bring someone to invest in this project. This is a bigger amount suppose if someone will invest 10 Eth in the project and will be in your referral list. Like that if you bring many more people to invest in the project then you will be millionaire with this referral program.
Yes that is a great amount for us who will work for the project to bring the referrals to the project to invest in the project. We have to invest that earning in the project and we will get a more higher amount of coins from the project and have to hold them for a longer time to get the real profit of the project.
I often find it very hard to collect people for the project in my referral link and to convince them to invest in any exchange. I do not know that in this case I will lucky or not. But I will try my best.