It seems like everybody likes to talk about strategies for different VP games, but the number one factor is LUCK.
I decided to try VP for about 6 months. and see if you can make any money at. I started by hitting 3 jackpots in one month playing progressives that got high enough to overcome bad pay tables. I hit only one where I played more than 3 hours, the other two I played less than 30 minutes.
I also put in long sessions on trying to hit other jackpots, only to witness 5 people hitting the jackpot by sitting down and playing for couple of hours or less.
The moral of this story is that unless you are lucky enough to sit down at the right machine at the right time you can play forever and not hit the jackpot, without the jackpot you will be a loser no matter what strategy you use or how fast you can play.