Well, I think gambling is a both thing ( Investment and Game), I mean everyone know that gambling is a game, and secondly, if we can say that it is just like a investment, So i don't think that something is wrong in it, Because when we invest our amount than this game start it.
Also gambling is a money game, So if we use our money than it has clear mean we are investing our money.
But i also know that many people are not agree on this point of view.
For who knows how to play is an investment, for who doesn't know how to play it's a hyip.
If you assure you can play gambling in a smart way, without big losses, and good profit on long run, it's the perfect investment for you. But if fear the game, think you can lose all any moment, better to don't come to the party.