Online casinos usually offer the gifts like Free Spins instead of welcome bonuses and loyalty to its users, free money for the player, so that the money spent on the slots is higher than is actually spent. The advice we can offer is to use the bonuses and gifts to then move to another casino to take advantage of the deals offered as options thus getting benefits are greater.
If the only reason to play slots is to get money with casino bonus and profit, perhaps that is the wrong strategy. As mentioned, the payout percentage of the machines never exceeds 100% of the long term so that the chances of getting benefits are slim.
The best option is to invest in the slot like a leisure activity, accepting that you can lose money. If they can get benefits everything is perfect, but you can not always be so. If you stay within your budget and you have fun playing, then your strategy will have been the proper slot.
There is such a range of slot machines, the payout different, it is very difficult to identify the probabilities for each of them. In general, they are expressed as a percentage of earnings to players. Higher the rate approaches 100%, the unit is generous and it is advisable to play. There are a few machines that have a percentage greater than 100%. These devices, called loose slots so you should bring money.
These slot machines with payouts to players greater than 100%, are usually placed in the middle of others. They serve to show that it is possible for players to win gains.