I recently made a transaction in bitcoin basically cashing out some change that had dramatically increased in value. I made a $150-ish purchase and paid a $15 t

I recently made a transaction in bitcoin basically cashing out some change that had dramatically increased in value. I made a $150-ish purchase and paid a $15 transaction fee. It took about 90 seconds for my transaction to be broadcast to the network and confirmed by multiple nodes. Yes, a 10% transaction fee is incredibly high, but I was spending essentially free money, and the utility provided to my by the vendor I chose is high. It would seem that getting your transactions confirmed is an auction of sorts at this point. While this is certainly not optimal for a currency, it seems like a problem with a solution somewhere.