In a 9/6 Jacks or Better game you would multiply .5% by $1.25 (this is a five coin, max bet game) by 400 (hands per hour). This would bring you to $2.50 an hour on a long term game. If you are playing a short term game, you are more likely to lose $6.50 an hour, because the house end for the casino will be higher (you'll have less chance of hitting the royal).
The differences can be quite large. If one site has 9-6 Double Double Bonus Poker (98.98 percent return with expert play), another has 9-5 DDB (97.97 percent) and a third has 8-5 DDB (96.79 percent), think about what that means: In casino No. 1, the house expects to keep $1.02 per $100 in wagers, casino No. 2 expects to keep $2.03 and casino No. 3 expects to keep $3.21.
You can travel throughout the country. In fact you can travel throughout the world and chances are excellent you will find video poker games in any casino you decide to visit. Most video poker games look very similar, which makes sense since most video poker games play the same way. But do all video poker games work the same under their similar exteriors? Find out more in this section of the Ultimate Video Poker Guide.
Stick to the proper way of how to play video poker as well as video poker strategy and you won't necessarily be able to become a professional video poker player, but if you're looking for the one casino game besides traditional poker where you can get positive expected value, or at least a very low house advantage giving you hours of play for a very small investment, video poker may be your game. 
So far we have looked at low variance and moderate variance video poker games. Low variance games have the advantage of a smaller bankroll size requirement and relatively simple video poker strategy. This comes at the cost of playing a somewhat boring game. Moderate variance video poker games are more exciting to play because they have more high paying winning hands. The excitement factor is offset, however, by higher bankroll requirements and somewhat more complex playing strategy.
In the early 1970s, when video poker was introduced and was still struggling for acceptance, the machines were usually referred to as "poker slots." And video poker has a lot in common with slot machines. They are easy to use, requiring no interaction with a dealer or with other players. Card combinations, like slot reels, are governed by a random-number generator.
Use a strategy list. A strategy list is like a cheat sheet, that has all of the different ways you can win in a poker game in a list ranked from best hands to worse hands. Using a cheat sheet will help you determine which cards to keep and which cards to exchange for new cards. For example, if you have the opportunity to go for a straight with an outside straight, or you have the opportunity to go for three to four of a kind with a pair, a low pair is ranked higher on the list so that is what you should choose.

Less interesting and less impressive was the page about “Video Poker’s Greatest Hits”. (http://www.videopoker.com/greatest_hits/) One of the aspects I found disappointing about this sales page was the lack of a price listing. There’s a button for a free trial, and another “buy now” button, but I don’t think I should have to click “buy now” to get a price. I did click through, and the price is only $19.95, but the software is limited to 8 video poker games.
Use a player card, and know the benefits of doing so. Casinos reward points for every penny bet in any machine, and those points can be redeemed for free play or comps. Free play rebates usually run from 0.1% to 0.33%. There are lots of other benefits for using a player card, like discretionary comps, free play mailers, drawings, and tournaments. If you don't use a card, there will be no evidence trail that you played, so you'll never get any of the freebies. This advice goes for any form of gambling. Finally, contrary to popular myth, the machines don't pay worse if you put in a card. The odds are the same whether you use a player card or not. 
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