[cortesoft]

I consider it gambling when your expected value for your return is less than 1.

So, if you run a Casino, I wouldn't call it gambling because your expected value is greater than 1.

Everything is a 'gamble' in the sense that there is a chance of ruin. It is a gamble to drive your car to work, because you could die in a car accident. People don't normally call it gambling, though, because it doesn't fit what we mean when we say gambling - taking a sub 1 expected value risk for the chance of a big return.