Greetings, Bonus is good enough to attract early investors and give them some kind of advantage over those that will invest later one,but not too big,in order to cause possible dumps,or discourage those who want to invest at later stages.
WEll said,and i think thats the key when you decide about bonus structure,you have to be very careful,as it can ruin the project in the long run.But Timechain team set it good!