If Bitcoin had a fixed value the majority wouldn't use it as their investment nor as a currency. Bitcoin could be used for the main reasons it was created for. People in need of an alternate currency for cross-border payments, free from any authority. Unbanking all of us to get a total control over our money. The idea of a cryptocurrency originated from anarchists.

And considering Bitcoin as an investment, sorry but there are better investments with your bank and much fewer risks.
I would rather prefer to earn a 6% per annum than to lose 400% in  2 months.