why not? If you don't like it don't click it. Is not that the main purpose of the web that everybody can publish a web site?
A bit like the postal system. Yes, it's meant to send physical letters and what not to my home, but it still sucks when I get ads that just goes straight into the trash. Yes, you're using the system as intended, but I still consider your business slop if you send ads to me this way.