You mean parabolic isn't sustainable?  But... When my friends told me to buy their Bitcoins, they said exponential growth was mathematically guaranteed?!  They showeded me all kinds of kinds of charts and told me about the Network Effect.

I didn't quite understand the maths behind the graphs they showeded me, but that Network Effect sounded about right, so I was even more confused when the price took a nosedive

I'm beginning to wonder if those friends of mine were really my friends, they all stopped hanging out with me after I ran out of money