I would add some reasons why you should buy ethereum:
1) It is still dominating on the ICO market. This was the main reason of its former growth and it can cause future pumps.
2) Technical level of this project is high when we begin to compare it with some other platforms.
3) Ethereum is still strong and there are many people who are interested in its growth.
Investments in ICO are on the decline and it will continue, which of course affects Ethereum. A strong team does not help to keep from such a rapid fall, as the interest in the coin.