I'm pretty sure the ads are not put up by the author by WordPress.com. According to their pricing page[1], they "sometimes" display ads on blogs to cover costs.
As a follow-up, I think the humor is that I imagine this blog might have valuable information, but you’re turning off your target audience with low-brow ads.
For the record, the ads are all Wordpress's doing, not mine. I have no control over them, and derive no benefit from them (on the contrary, they put me off too!).
