You don't always have the opportunity to watch sports, go to the movies etc. but if you have money to give someone playing a video game then you most likely have money to buy and play the game yourself. Yea people pay for entertainment but you DON'T have to pay to watch people play games. If a streamer was entertaining enough to where you could only watch them if you pay then sure, but you don't have to pay so giving them money purely because you enjoy watching them play games is beyond me.