Earlier quoted context omitted.
I don't know about you, but I don't think $25/mo is worth cheapening my blog by plastering tasteless ads on it. I'd have to be pulling significant income from it before I would even consider putting ads on my blog.
That's $300/year. Why would you throw it away?
TL;DR: the cost of that extra 82 cents a day is having your site cheapened by advertising that you don't necessarily control and that negatively impacts your credibility. If the spare change isn't going to make a big difference, the perception that you don't need the money is of more value.