You know full well that Google is charging content creators way, way over their costs, even if they qualify for the more lucrative partner programs (most don't - the long tail - and those who do are the better off YouTubers), exploiting their monopoly position to extract money to an unfair extent from both content creators and advertisers.
So, I do think it's weird that you defend one of the richest and financially exploitative corporations on the planet and all your criticism is for me for skipping the annoying and repetative ads and not for the exploitative monopoly corporation.
The content creators make content using which YouTube/Google earns vast sums of money in advertising. They top slice most of the money for themselves and forward very little of it to the people who worked to create it, so in that sense they change the content creators. They're one of the most profitable companies on the globe. Where does that profit come from? It comes from underpaying content providers. Still don't know why you're defending them. They dropped the "don't be evil" plan and they meant it.
They're not spending ANYTHING like 50% on the tech work. Reminder: one of the most profitable companies on the globe. The huge profit comes from the HUGE gap between their costs and their income. So no, it's not proportionate at all, and it's gullible for anyone to pay them to reduce ads when they could block them for free.