Yes in the general opinion, gambling shouldn't be taken or seen as an investment
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Not in general but in any opinion gambling should never be considered as an investment because the ones who gamble often get so involved in it that they forget about the risk of losses. Many gamblers lose thousands of dollars per day while investors can't risk to lose that much.
Either ways you both presented it, gambling is not an investment, the only way we can consider it an investment is on those who have invested to start a gambling business as their own establishment which I believe could have involved alot of money as well, but for any gambler who thinks he could also finds a means of living through gambling may be totally wrong about it.
My friend Dunamisx were are aware of the fact that gambling is not an investment, and all the comments have pointed out the factors that make gambling not to be an investment out for a better understanding of the point we are trying to pass.
But on the other hand, we were discussing a pathway to make some positive decisive decisions in gambling, and for that the reason why we both mentioned investment mentality as a gambler in our comments, I hope this comment helps you gain more understanding of our points.