Thanks for the tuto on youtube bro!
Just to clarify,the whitepaper is outdated. Steem inflation is not 100% per year anymore, it's around 10% and gradually going down for the next 20 years.
Power down period is also not 104 weeks but 13 weeks.

Rewarding users is not an end in itself, the real goal of steem is to bootstrap a currency that people use in the real world, which is why people are incentivized to hold their steem. Soon you will be able to buy many thing with steem but we are still early in developement