Your example is not a very good analogy. Cars are terrible stores of value, very few cars actually go up in value. However if I were take your example, let me say that the highly sought after and lowly produced Ford GT was easily had for MSRP and went up in value by many times. Perhaps the challenger example is not a good example as it's no supercar and not nearly as sought after.

Additionally sentiment is not an accurate measurement, as cryptocurrencies true values are based off use and spread of the network. Sentiment is only useful as a barometer in speculation on future pricing, not on growing market share. All these technology companies are not in a bubble they are gaining value because they are increasing in use and market share.