If Bitcoins aren't tied to a conventional currency, how did they get so valuable? I would appreciate it if  someone could provide me with some insightful information.
At first it was simply because a decent amount of people accepted the fact that it had a value and used it as a currency even if it was not backed by gold or oil like conventional currency (that still does not have intrinsic value), if you mean how it achieved such an insanely high value the answer is even simpler: speculation; people started buying the currency not to use it for transactions of goods but to simply make a profit from the fluctuating value, buying low and selling high.