@mrviquez Since Steem is a very young platform, there is less competition for rewards. Basically, this means early adopters are getting a bonus. As more users come onboard (view charts), there will be more competition for this same reward stream.
Consider the first Bitcoin miners. It was fun and easy for anyone to jump on and get a good chunk of coins as long as you had the know-how
The main currency that this blockchain generates is STEEM and it is base for everything. You can trade it in exchanges. And I suggest to invest only in STEEM if you decide to