I read somewhere that Vegas casinos are bringing back penny slot machines because they can make a huge profit.

Actually, you're right about that. It seems that with the current recession, penny slots have become more popular than ever, and lad-based casinos are profiting from them. But, you will be happy to hear that online casinos pay a much higher percentage than lad-based casinos regardless of whether you play for a penny, nickel, dime, quarter, or a buck! Statistically speaking, land-based casinos' percentage is around 87/9 percent, whereas online casinos are about 98.5%.