When people are trying to justify ads, they often lean on "our servers cost $X per month and we have Y journalists paid $Z per month, therefore we need revenue from ads" which makes it sound like they need to raise a fixed, finite amount.

That sounds much more persuasive than "our billionaire owner paid a lot of money for this for-profit business, and he'd really like a return on his investment"

But you're right, of course - the fact someone pays a lot of money for something doesn't mean it won't be plastered with tawdry ads.