Hi PLT. I know what you mean about being able to buy more pennies than big board stocks. It's all a matter of personal preference and risk tolerance. For example, if a penny stock has an ask price of $.0004 and you have $1,000 to invest, you could buy approximately 2.5 million shares. With that same $1,000, you could also buy 100 shares of a $10 stock. This is just my opinion, but there is a lot more risk involved and less room for error with the $.0004 penny stock than the $10 big board stock. But, again, it's all a mater of personal preference.
Shorting a stock means to borrow positions of a stock from a broker using a margin account, sell them, then buy the shares back after that stock's pps goes down to pay back the broker. The difference in price is the profit. You can also buy options contracts, called puts, to short a stock. Short sells are bearish on the market, believing that the pps will go down and money can be made by "shorting". Sell first, buy back later at a lower cost; buying low and selling higher but in reverse order. Shorting can be somewhat more aggressive than a long position because you can lose a good amount of money if the stock does not go down, but insetad goes up. You then have to "cover" your short position by buying at an even higher price. Have you ever heard the phrase "short squeeze"? When a stock's pps starts going up, the shorts scramble to cover and the pps subsequently can rocket up for a bit.