I agree that gambling in its nature isn't bad, even leaders of a religious group in ancient times throw lots to arrive at a decision. That includes punishment, land division, and something that the tribe leader can't decide. It is excessive gambling that leads to sin is forbidden so gambling in moderation that does not lead to sin is ok, IMO. It goes the same with food - gluttony is a sin, money - greed is a sin, desire - lust is a sin, and the rest of the 7 deadly sins.
Indeed. It depends on our action if we gamble. Gambling is not a sin (though there are some religion particularly Islam who are against it) but you can be a sinner depending on how you deal with it. Gambling is existing for long years already and up to now evolving to give entertainment or to get more from the value that we're willing to risk. If you cant handle yourself (lacking of control and discipline) you're likely to end up as one of those gamblers who are not playing in moderation and had to face the consequences for doing so.
Gambling is good for everybody depending on how we want it or how we want to bet and earn on it. The religion might be against it but sometimes we just have to find something for ourselves that give us what we want. It has it own bad and good expects which makes it more rewarding if we are on the right track. Gambling can make us regret why we enter into gambling and how we want it.