because you can earn and loss profit at short period of time
not only that. however, gambling was consumed us. time becomes useless because we do gambling.
If you think gambling is just wasting your time means that you do not know how to manage your time, nothing else. So you need to learn how to manage your time on gambling, this is one of the most important parts on how to control yourself on gambling.
Yep, count time as one of the resources you invest with gambling. Not only you lose money with gambling, you also lose time which i have to say is way more valuable.
If it is gambling you are talking about you can certainly can lose lot of things from it, it can be an addiction or you will never have time to spend with you family, friends, and yourself too so that is why time is more important than money itself.