In brief: BTC has value, as judged by the market. Some of its value derives from some people's belief that BTC may one day dominate world trade, largely replacing USD and the rest. Some of us (apparently a minority--but that's okay!) value BTC less than if those early blocks had been generated at higher difficulty and/or appeared to be in circulation. In our global, industrial culture, money can be leveraged into power (and often back into more money).
You're being overly paranoid IMO. In any speculative venture, there are always early adopters that are rewarded big for their initiative. The early adopters not only discovered it, but in the case of Satoshi, created the technology. It's fair that they are rewarded.
I think you also have an economic misconception that a sum of money equals permanent control of a percentage of the economy denominated in that currency equal to the percentage of the currency someone holds, in perpetuity. In reality, each dollar or bitcoin is traded numerous times. Having a certain percentage of currency at any given time only gives one a tiny slice of all wealth over a long time frame.
Also, the 20% that the early adopters have now will only be 7% once bitcoin has expanded to 20 million. They can only spend it once. After they've spent it, it will be spent over and over again by others.
