I work as a coder for a big porn website and I can confirm this. I've seen customers throwing away $10,000 a night on our site. Much like mobile gaming, this industry heavily relies on whales.
Like twitch you can spend money to have your donation read / request fulfilled.
One time I saw a sex toy that automatically updated the setting to the highest bidders request so there would be a tug of war between those increasing and lowering the setting. Definitely a great revenue stream if you are savvy.