Buying ETH now would be incredibly stupid. The risk of it falling far outweighs the possibility that it will double in price. There's a hell of a lot of difference between doubling 100m and 1b. It is totally obvious a crash is coming.
There isn't a lot of volume on sell orders in order to make it very difficult to double again.However, the majority of the trading being on polo is kinda fishy for sure but still i would have my doubts that it wont be much down even if it crashes to some lesser value.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 
I think the core drama is pissing off people day by day and the mentality to increase the "bitcoin number" is going to change at some point.