I've just found this guy on cryptocompare, so apologies if it's been posted before, but the search function showed no results.
Here we've got the perfect example of why you should buy and hooooooolllldddddd. Sort his buys by oldest first and just look at them, he went in with tiny sums of money, maybe not quite tiny in a few trades at the start, but hey, we all know how that worked out. The trades starting from January 2017 are so impressive though, just hover above the total value amount and you'll see his actual investment size in each. His sells are cool to look at as well.
https://www.cryptocompare.com/portfolio-public/?id=188
That DigiByte though, $560 to $92000 in 3 months! yeah, mmhhhm.