Think about the whole process
In offline fruit machines, slots can be identified and observed for possible outcome.
This can be achieved by watching a players input/output ratio, by how many times the board allows them to hit the feature and by how far into the feature they can go. They can also be targetted by listening to the tubes, by how coins drop through, by how value won compares with value won next and thereafter.
The difficulty in online, is that you play a massive system, but in big systems, bigger jackpots lie in wait.
As for myself, i once won a golden violin jackpot, was around $600.00 on a lucky 7 machine simulator, it had cost me around $30.00 to do it.
Thats around 5 percent of the total gained.
If other people have won online, then please share your value in to value out, it seems that around 5 and 10 percent are significant ratios.
Perhaps we can begin further study into this field, online roulette is currently observed in great detail online, slot machines are the next venture.
Good Luck guys, look forward to hearing from you.