When I asked when was the deadline to invest in NXT while it was still open, it was suddenly closed without any advance notice, and I was not allowed to invest in it. The deadline was not clear in the announcement, but most people, including myself, thought it was January 3, 2014. The genesis block was not created yet. It is very clear to me that they did not want any further dilution of existing investment, though no one will admit this. If there was some technical reason for ending the pre-sale early without advance notice, they could have just said something to the effect of "We are closing the sale now, so if you want to send in your Bitcoin you need to do so within the next X hours." They did allow another coin in which was sent while I was waiting for an answer. A week later, NXT was being sold at a 4762% markup over the presale price.

The presale of Ethereum, like that of Mastercoin, is very well defined with a clearly defined period of investment, and in the case of Ethereum, a clearly defined limit on total investment. NXT, on the other hand, was arbitrarily closed at the convenience of the founder with no advance warning, and not everyone who was interested was allowed to invest.