Viewerships don't earn the scene and riot as an extention money, like modern mba( great channel btw) puts it, viewership are just "vanity metrics" , but what viewership does is:
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Attract more orgs to join the scene, because more views = more merch purchased = orgs earns more money by tapping in the market
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Attracts more sponsors, more viewership = more exposure towards brands = more sponsors = more capital flowing in, this is why japan t2 have 16 sponsors in split 2 in contrast to other regions
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More skin sales, self-explanatory
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Generate interests around the scene
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Allows for more off season events
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Gives the region more leverage compared to others
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Etc
It should've been obvious and needs not to be said but I've seen many people here overestimates or underestimates what viewerships can do.