I have no problem with plugins encouraging donations... but WTF!?!?! putting a massively huge banner ad on top of the post editor is a MAJOR FAIL.
Please keep donation appeals on the plugin settings pages, or a pop-up when first installed... I have no words for how inappropriate I find adding a huge banner suddenly getting added to the post editor by a plugin I installed on a client site 2 years ago.
5 stars... to 1 star... Trusted developer... to untrusted developer...
Ads like this really should be banned from the repo IMHO. If you want to make this a commercial plugin, by all means take it out of the repo and do that.