If you consider Bitcoin as a real currency, you can replace it and apply it and the world is recognizing it. You always appreciate the value of Bitcoin over time. See the Bitcoin discount as a good opportunity to buy.
Here, investors believe in the long-term value of Bitcoin. So when prices drop, they buy more. Although the market is very hard to guess, it means buy at the price lower (bid at the bottom) and as soon as the price is up. Strong discounts allow investors to spend more money to buy Bitcoin than a less volatile market, without much change.
If your current thinking is that Bitcoin will grow strongly in the months and years to come, let's all think together and there are certainly quite a lot of people out there for Bitcoin.
In my opinion and based on what I have seen most here in the forum about their reason why the lower price of bitcoin is opportunity to buy is because many hodlers or many investors believe that once the bitcoin starts and begin its price at its lowest they believe that it will soar high and fast to its biggest price that all people will tend to sell their invested bitcoin at the higher price. Like the phrase say's "buy low, sell high".