You're not following the teachings of Jesus if you gamble.
HE says it several of times - loving money and trying to get them the easy way is WRONG.
Jesus has never said loving money and trying to get them the easy way is wrong...lol
However He did say, "Don't store up treasures here on earth, where moths eat them and rust destroys them, and where thieves break in and steal. Store your treasures in heaven, where moths and rust cannot destroy, and thieves do not break in and steal. Wherever your treasure is, there the disires of your heart will also be. ---Matt. 6:19-21
"No one can serve two masters. For you will hate one and love the other; you will be devoted to one and despise the other. You cannot serve both God and money."---Matt. 6:24
Now as far as gambling is concerned, there are all different types of gamblers, the high-rollers, the every day degenerates who have to get action somewhere almost like a drug addict that needs his drug daily so to speak, the occassional type, etc.
It is very hard to get accurate statistics but most sources believe that only a mere 3 to 5% of gamblers actually make money in the long run and so for you to say it is easy money in reality it is quite the contrary. The majority of gamblers do not store up or hoard any money from gambling because they are losers.
Gambling is a very bad habit for many, ruining you financially as well as socially if you let it get out of control, however if you're the type of gambler that occassionally gambles and is not out of control with it then it is ok, so it depends on your personal situation.
Gambling or investing money in the stock market are not sinful acts, both have risks and rewards, but as I have mentioned the rewards in gambling are just for a few in the long run so one is better off just not gambling at all.
Lastly, always know that in your life God is first!!