" If someone is hosting their own blog and use ads to help offset that..."

It used to be that hosting your own blog was a hobby, not a cost-neutral or revenue-positive venture. Like any hobby, you did it for your own enjoyment and if other people enjoyed it, too, then that was a benefit and maybe you'd made the Word a little better.

So if you're not willing to pay a few pence per day to cover the cost of your hobby out of your own pocket, then the answer is "stop blogging" rather than "I shall inflict ads on those who dare to view my output".