Stocks trading under $1.00 were almost always small companies struggling to find their place in the market and as a result those securities were very speculative investments for traders or investors.
In this day and age, securities priced between $1-10.00 in many cases still represent some of the most speculative and risky investments. This is especially true for small companies in the Biotech, Internet, and Fintech sectors.

These stocks can come out with news overnight that result in a 50% drop to the downside or a 100% squeeze to the upside. Anyone investing or day trading in these types of securities has to be prepared for the possibility of a total loss.
Just for reference, when I took $583.15 and turned it into over $100k in 44 days, I was primarily trading stocks between $1.00 – $5.00. These stocks all meet the min listing requirements for the exchanges, which is important to me.
If I’m putting my hard earned money into a stock, I want to feel confident the company isn’t going to disappear overnight.