Re: In this scenario, which buyer would come out with the bigger profit?
This is all hypothetical. So lets say there is Buyer A (John) and Buyer B (Mike). John buys $1,000 worth of altcoin on February 2018 and holds. Mike buys $1,000 worth of the same Altcoin as well but he buys it 10 months later on December 2018. On February 2018, the coins price was $1.50. From then until December, the coins price has fluctuated a lot going from $1.50 to $15 back to $1.50, back to $15, then skyrockets to $50, back to $15, a bunch of phases going up and down both slowly/rapidly, and its eventually back to $1.50 in December. Literally couple days after Mike buys the coin priced at $1.50, the coin skyrockets back to $50. Who will have made more profit, John or Mike? 
Mike is the one who bought the coins with the cheap after all the price fluctuations has been done. There are many coins in the market if this is real in the market that should be ripple. Now its price is around 1 to 1.5 USD.
This will be bumped more than 15 USD in some months. Thinks that investors are getting more profit by investing on this coin alone.