~snip
There are several strategies that can be used if we have large capital and what you mentioned is one of them. Buying several types of potentially altcoin is a good strategy.
Although we all know that almost all the prices of altcoin will go down when the price of bitcoin goes down and vice versa. If we have a lot of capital, then it would be better not to spend it on one purchase because we also have the opportunity to buy some additional altcoin if the price is lower than the first purchase.
But most probably this person took the risk of spending all his money on a single coin and profitted on it when a pump happened. Most wealthy people won't admit that they just got lucky which I think is what happened here. Bitcoin is pretty much like stock market and casino combined. Going big does not necessarily mean that you'll go home a happy child. You gotta hit that sweet spot in order to profit big.