It's also because miners have to pay for the costs of the equipment and electricity they incurred when the BTC peaked at $30... and let's not forget the possibility that some early adopter really, really wants to get his hands on that Porsche.
Truly, what Bitcoin is doing today, next week, next month, is almost irrelevant... it works as a currency, it works as a commodity or an asset, and contrary to the fairly baseless statements made by OP, there is a rapidly growing community around it, which includes lots of smart people implementing lots of smart ideas.
Uh, miners costs were no different when it was $30 than it is now...and yes I agree, the "early adopters" can and will continue to bleed as much value out of bitcoins as they possibly can.
And a rapidly growing community means exactly jack shit to such a supposedly AMAZING financial instrument where there NO ECONOMY backing it up.
Welcome to the future.