You might be surprised, but: the need. I can't convince someone to use bitcoin if they don't care about censorship resistance, nearly instant, cheap transaction settlement and privacy if they don't care about any of those. Tell them about censorship resistance and they'll respond with "I'm not going to do anything suspicious / bad for PayPal to suspend my account". Tell them about instant transactions and they'll respond with "PayPal is fine". Tell them about the fees, and they'll respond with "Revolut charges me zero" (without minding the merchant). Tell them about privacy and... Lol. 

Now add the shitload amount of misinformation there is, the little demand, and the fluctuation in price.