Many people still can't understand what bitcoin is and how it works, and instead of learning about it in detail, they buy altcoins they know nothing about. Worst of all, they just trust the first blogger they see and make purchases based on his recommendation.
This is how the story goes - this blogger will get money for that, and that investor will most probably lose or will hold the coin that will stuck on one point. Anyway, Bitcoin is not the best for investing if you're not a billionaire

You have to invest in other coins also, that's a usual trading practice.