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it is counterproductive for early participants, because their share in Nxt will be significally reduced with new participants coming.

At the first look it feels so, but this is utterly wrong. If Nxt fail to receive a lot of participants and hands in, the coin will die since it plans to be a pure POS coin.

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This initial distribution scheme provokes people to send more and more of BTC, until the anonymous author did not resist the temptation and decides to disappear.

That's why I asked him to put a cap, it is 1 BTC now.

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If the author does not want to rip people off, he should change the distribution scheme for less provocative. For example, distribute Nxt equally to the first 1000 forum members (with >1 month old account and > 30 posts), which send 0.01BTC via blockchain.info.

It doesn't work, because of sockpuppets and also in general there might be people out of this forum who may want to get in.

To BCNext: as a side suggestion I think putting let's say 1 million of coins aside and making a giveaway thread to offer people some coins for their attempts of spreading the name and theme of this project and coin would be very effective to bring more people in. You can make a poll to ask about it from the current stake holders, if you are worry about transparency matters. dacoinminster did this for mastercoin and it became very effective, people shared the mastercoin voice in different places and forums.