If you want to look at it that way, day-trading stocks can be gambling. Heck, even regular buying of stocks can be gambling. Anything that isn't "certain" is gambling.
The important thing is to find an type of investment opportunity that has a good team, solid financial, and a healthy outlook. If it meets a need and can be efficiently brought to the masses at a reasonable cost to the consumer in a timely manner, then INVEST!
Yes, you may buy at the high, but if it's a good investment, who cares? It will go up even more in the long run. Warren Buffet doesn't wait for stocks to be cheap. He looks for companies that have value and just buys them. Look how that's working out for him. He still has risks, but he makes informed "bets" that often pay off. (Wells Fargo is a different story)