Being a successful slot machine player is impossible. The machines in every slot are created to provide the house with a long term edge, so the house will always be in the lead if you are playing for long enough. The only way to counteract the house edge on slot machine games is to play the game with a huge jackpot. Bet the max every time you play, and hope you can win the jackpot. If you do win the jackpot that is really huge, guess what you do next? Quit playing the game.
Don't get me wrong. I'm not saying you shouldn't play slot machines. In fact, I think slot games, particularly those that are really good, are a lot of enjoyable. However, you must keep in your mind that mathematically, what you're doing by playing an online slot machine on a long-term basis is paying for entertainment. It is possible to calculate the amount you're paying for that entertainment simply by multiplying your stake by your average bet times your quantity of hours played.
For example, if you're playing a slot game that pays 95%, then there is a house edge of 5%. (The casino retains 5% of every bet that you place over the long-term.) And if you're average bet is $3 you'll be paying an average of fifteen cents for each spin back to the casino. (5% times $3.) If you're playing 500 spins in an hour, this game will cost an hour of play for $75, which may or may not be a reasonable price for you entertainment. It all depends on how much money you have.
Another factor to take into your calculation is how much the bonuses and perks you receive at the casinos are worth. If you're playing in a land-based casino where you're receiving drinks for free while you play, you can subtract the cost of these drinks from your hourly rate. (Or you can add the cost of these drinks to entertainment that you're getting--it's only an issue of perception.) My suggestion is to drink the best liquor available and premium beers to maximize the entertainment value you're getting. For instance, a Heineken can cost $4 per bottle at a good restaurant. Drink two Heinekens an hour, and you've just decreased the amount you pay to play every hour, between $75 and $68.
Slot clubs also refund the amount you lost each hour, so definitely make sure to join the casino's slot club and use your card to track your play. There's no reason why you shouldn't to do this. The casinos also offer their larger slot players with bonuses like meals, show tickets and rooms for free, that all lessen the amount you're spending each hour that you're playing on their machine.
How can you become a successful slot machine player? I'd sum it up by saying know how much it costs you to play each nya casinon time and every hour, take advantage of all the comps and the perks and try to win the biggest progressive jackpot.