Is there an idiom or expression saying or implying that gambling is a good thing? I am pretty sure there are idioms about gambling, but I am not sure if any of them are "positive".
The following idiom has a positive connotation about taking risks:
- If you don't risk anything, you won't gain anything.
you've gotta be in it, to win it
The implication is that you should gamble as that's the only way to win! Lotteries and the like often use this.