It only takes one spin to win a jackpot. I've read on jackpot madness where someone has just joined the casino and pulled the slot 2 times and wins. It's just a matter of being in the right place at the right time when that chip pops up the right numbers. Watching to see which games you think are ready to go (slotcharts.com) - and trusting your gut. Something told me to play TN instead of one of the other progressives Sunday.
It's a rush to open the software and see my name on the news of the day too

They've called me like 5 times, and are sending me a 'surprise' Wednesday - I'll let you know what it is. Before I've received promotional items (nice ones) - shirts, cups, mugs, ink pens, caps, camera, duffle bag, backpack, sunguard for the car, magnets, etc.
I spend about $100 a day - try to maximize all the bonuses (so play at different casinos) - stay away from the ones that I've never hit anything on (like 32red sorry!) I play the progressives almost exclusively. The only reason I play another is because the game is new, or I need to try to build up my bankroll a little.
Some days I may spend a little more than $100 - and some days I don't gamble at all - but on average I'd say $100 a day. I've had some other wins that I've cashed out (10K or less) - and of course played through a lot of wins.
If i just want to play for the sake of playing - I'll play a for free casino that I downloaded. Or i'll go to pogo and play silly games there.
And in case this is the next question - I'm a web designer since 1997. I work at the computer most all day long.