I'm happy for you that you're always the perfectly informed player in every transaction you ever make having the most up to date information, ensuring that you're getting the best deal possible at any given second, groceries and all.
Sadly, some poor slobs are too lazy to be as informed as you.
I do none of those things, but I understand that there is a chance of losing money gambling in the stock market. Its not a free lunch with 100% upside.