It seems because they have no idea at all how Bitcoin will be in the future, not because they don't care, and actually it's not just Bitcoin because Dogecoin is one of the coins also widely used for gambling, and at that time gamblers would bet thousands of Dogecoin on a single wager, which compared to its current price would be worth thousands of dollars for one bet.
The future is not something that can be known precisely, even when trying to predict it, it may not be accurate. This is especially true in the case of Bitcoin, which was truly unexpected by many of its owners at the time.