Let's take a look at what the TOP cryptocurrency looks like now, in 2018 :
In 2017 and until August 2018, almost all coins rise, but some mastodons March 2017 now feel quite different than a year ago:
For example, MaidSafeCoin is now 64th, not 10th as in 2017, and Augur has grown only 2.5 times and closes 3 dozen list coinmarketcap. But while changes in the first 10-ke does not seem so significant.
We go further into the past, in 2016:
From 2016 to 2017 from the TOP 10 disappeared projects such as Phantom, BitShares-fell in price, despite the overall growth of market capitalization. And Dogecoin, Ripple and MaidSafeCoin showed an increase of only 10-20%.
Next year 2015:
Comparing these figures with the figures of 2016, we see that NXT retreated from the list of the best 10 coins. And once the TOP 10 PayCoin generally fell from 10 to 104 positions!
Rippl, BitShares coins remained in price at the level of 2015 and did not increase in price.
Thus, the strategy "to collect a portfolio of TOP coins" with the expectation of imminent growth, if the entire market will develop - not very working.
Today's noname for most (e.g., Peercoin, and Namecoin, Emercoin, Decreed) have also been hits before.
Food for thought...