Solid numbers about blogging incomes are hard to come by. For example, in the US, the Bureau of Labor Statistics lump bloggers in the very broad category of “Writers and Authors” which has a median income of $61,240 per year. That’s not an accurate measure since there are vastly different occupations included in that category. Information from small surveys and anecdotal evidence can also be found online, but much of it is outdated or taken from tiny sample sizes.
Selling private ads can come in the form of banners, buttons, or links. You can even make money writing sponsored posts where you write about or give a review of an advertiser’s product or service. Another option is to write an underwritten post or series, which is where you can write about any topic, but the advertiser pays for a “Brought to you by” mention in the content.