a. http://coinmarketcap.com/currencies/ethereum/#charts
b. http://coinmarketcap.com/currencies/nxt/#charts
Compare the following facts...
i. NXT was backed by a centralized organization, just like ETH.
ii. NXT was PoS, just like ETH will ultimately be.
iii. NXT offered asset exchange, while ETH offers smart contract. Both of these functionality, which they claim to make them unique, are actually possible on bitcoin blockchain, which is far more secure.
iv. With price rise, NXT backers sold their holding to increase liquidity in the market. With price rise, ETH backers are increasing ETH supply in the market to increase liquidity in the market.
p.s. Alt coin trading is a gambling. If u wanna test your luck on some coin under pump, its fine. But, make sure to come back to BTC, when u have made enough, otherwise u'll lose all and have to be a mute spectator while the next alt wave hits. GooD Luck