This plugin is okay, but the call to home for the purpose of pushing ads earns it a 1 star rating. Not only do ads get pushed to the plugin itself, but to the Dashboard also. Sorry, in my opinion, self-promotion in this manner amounts to spam.
Dude, if you're going to bother developing a free version of your plugin, don't use it to spam. If I really want a "Cyber Monday" deal on your plugin, I'll come to you. Don't come to me.
Refer to paragraph 3 of section 7 of the Detailed Developer's Guidelines - In general, things like banner or text link advertising should not be anywhere in a plugin, including on its settings screen.
I would think this ESPECIALLY applies to the Dashboard.