I've played them - online slots are easy, easy money as long as you are not addicted. The fact is, slot machine players are the most addictive gamblers you can get. There is the old joke about the Vegas casino that catches fire... the first people to leave are in the VIP bar, the next are the poker players... then the Black Jack players, then the roulette and craps players, then after the place has burned down they find the bodies of all the slots players who wouldn't leave the casino.
The way online casinos work for slots is they give you a hefty bonus and they almost always let you win a nice jackpot in order to try to get you addicted to the feeling of winning. Online casinos don't make money off every play (like poker rooms do) - just the opposite actually. 50-60% of online casino players (I know, I used to work in the industry) make money (the winners average like $200 profit each)... however, the 40% that lose average like $1200 or something high each - which is why online casinos are so profitable.
If you have the self-control to deposit $200 at an online casino - sit & play slots until your bonus clears and then cash out your deposit, your bonus and your probably mini jackpot win (usually about $300) chances are you're going to make money. However, if you have even the slightest bit of a "gambler" hidden away inside you... STAY THE HELL AWAY FROM ONLINE SLOTS.
I've won a $2K jackpot at
Vegas Red Casino on my second pull playing slots hahaha.
I've also milked
Golden Palace for all they were worth. They have an instant 300% bonus. I deposit $100 and got $300 free (mind you you can't cash out the bonus until you've waged a fair amount)... so then all I do is cash out my initial deposit ($100) since there is no restriction on that, it's my money... and then I just play with the bonus. If I lose the bonus before I've reached the cash out restriction so be it... I've had fun for a few hours at no cost to me. All other scenerios result in me cashing out
their. I've made piles of money from online casinos - I've literally done this "play with the bonus" trick at 20 online casinos (although it works best at Golden Palace). Of course - I am very far from a gambling addiction and am in full control - if you have even the slightest gambling addicton don't try this - because you'll have trouble cashing out when the times comes and then you'll end up not making any money (and maybe even depositing your own money and losing it instead of just playing with the bonus)