If it was not a bubble, it did neven do X10. For some real and huge company (for example Apple) 10X is unreal in a year. Companies do not grow so fast, even very successful. "Something behind the stocks" can be considered as a barrier. Bitcoin has nothing behind that and... Sky is the limit!
The beauty of Bitcoin is the price is entirely dependent on psychological factors. The value is entirely based on what someone THINKS it should be worth. That makes Bitcoin PRICELESS.