This happen to me 3 times. If you are convinced that there was a violation, do not waste time. Open a ticket to send the DMCA and a report with the evidences (screenshots, code comparison, etc.).
Take the opportunity to make an improvement in your plugin or documentation and change the name.
Very good idea. I agree 100%.
Very slow month in sales until the moment.
I guess not. Another author can use your item as a part of other product (bigger than first), under extended license and your permission.
He wants make money over your work, offering a minimal version of your script? Without a partnership?
If I understood well, I don’t see reason to you allow something like that.
September/2014: second best month for me.
The best was August/2014