Buying cheap is an important step, as a way of life.
However, the important step when investing is the moment of selling.
When dealing with investments, there are two more factors to consider; they are yield and risks.
The clear difference between Steem and other Cryptocurrencies in the yield or in other words, the possibility to be part of Steemit and earn here something similar to interest. It demands some work but the return on it is huge.
And so, the selling price becomes less important as you've earned here enough "interest".
Concerning risks, I don't have to evaluate it as the model is earning yield, and looking at the growing pace of Steemit as like having an insurance policy.
My conclusion is:

1. Buy Steem.
2. Transform it into SteemPower.
3. Provide valuable content for the community.
4. Be happy.