People are still buying bitcoin because they believe in further price growth. And Bitcoin has made many millionaires and billionaires only by trusting and investing on this technology. So I think that it's okay that people still buying bitcoins and doesn't matter what reason.
It's funny, this topic is 2013 and the author dissuades buying bitcoin)) 
His price then (April 19, 2013) was about $ 130, and now about $ 6000. In my opinion, this is a very good investment))