The way I see it is that you want there to be an uneven distribution of bitcoins anyway. You want there to be a smaller number of Bitcoin-rich people initially, because these are the people who are actually going to spend their bitcoins and thus encourage merchants to start offering their goods in exchange for bitcoins. Those with only a few bitcoins are less likely to buy anything with them.
To illustrate what I mean: imagine if 10,000 people each had 5 BTC, so that's 50,000 bitcoins between them. That's a perfectly 'fair', equal distribution for each of those 10,000 people. Nobody has an 'unfair advantage'. Now if there is a merchant selling something for 5 BTC or $25 (at today's exchange rate), each one of those 10,000 persons might desire what the merchant is selling, but ultimately decide not to buy it because it would cost them all of their bitcoins to do so. Let's just imagine they all decide to buy it using their dollars instead, because $25 is pocket change to them, and so they can all afford it. But then why should this merchant even bother offering their product for bitcoins? There's no bitcoin business happening; all of the merchant's sales are in dollars. In bitcoin terms, their product is too expensive because the marginal utility of 5 BTC is higher for all 10,000 people.
But if those 50,000 bitcoins were instead in the hands of only 5 people with 10,000 BTC each (and the other 9,995 people in this scenario all having 0 bitcoins to their name), those 5 people will not have any qualms about making the purchase in bitcoins instead of dollars, because the cost is only a small fraction of the total bitcoins that they each have. They wouldn't miss 5 bitcoins out of 10,000 because they're Bitcoin-rich, rather than the previous scenario where everybody was equally Bitcoin-poor. The value of 5 BTC diminishes the more and more bitcoins you have, exactly like how the value of a given unit of water diminishes the more and more water you have. So much like how $25 is pocket change for most of us, so too for a person with 10,000 bitcoins is 5 BTC pocket change. So from the merchant's perspective, he's doing 5x more bitcoin business than in the previous, 'fair' scenario. In-fact the merchant could probably bump the price up to 6 BTC, to cover his own risk of getting involved in this newfangled Internet currency, and he'd probably still get the business from those rich bitcoiners who could destroy 1 BTC if they wanted to and wouldn't even notice it. So you see, it gives merchants an avenue to actually get involved.
Obviously that's a very simplistic analysis but I think it holds true. Those who managed to mine thousands of bitcoins early have more incentive to actually spend them today, so it all evens itself out. So I don't care about the lucky early adopters at all. Good on them. The reality is, so long as they did not get their riches through violent or fraudulent means, but instead through voluntary, peaceful means, it's all perfectly 'fair'.
It's similar to how in this video it explains that rich people drive the initial growth of new products in the technology sector, because they're the only people who have enough money to make the initial purchases to buy the worst, most expensive versions of the products that we all take for granted today. Without having the rich people as a market to buy these products in the first place, it wouldn't be profitable to even begin:
http://www.youtube.com/watch?v=0FB0EhPM_M4