Bitcoins are issued by miners, who pay to keep the network secure. Thus making bitcoins valuable. There are no freebies.
Even miners who sell immediately are making a profit that comes entirely from people who buy bitcoins expecting to profit from them by that mechanism I described.
Miners who mined long ago and held, as well as the early adopters who bought thousands of coins for nearly nothing, are just like the issuers of private money who keep some of their issuance to spend when it has been accepted as currency by other people.
Of course, miners need to stay profitable. That's part of the security. It wouldn't be worth much if the whole system was shut down every summer or Christmas. But not everyone who buys bitcoins expect to make a profit. There are a lot of speculators in bitcoin now, but a a growing number of people use bitcoin for money/wealth transfer. Most notably in your neighboring country, Argentina. Your assumption is that it's a zero sum game. A pyramid-like structure. But if there is wealth creation in the network itself, if Bitcoin has utility, then that assumption is wrong.
Regarding early adopters. It's not called socialist-coin. Yes, there will be concentration of money. There always is. But that is not freshly minted coins. The market is aware of them and will gradually take them into account as the Bitcoin-economy grows in reach and sophistication.