I will try to reply
frosticek
No, you should not duplicate those threads, we want to return to a support-only forums. Giving/asking support for your theme/plugin is ok, selling them is not.
Montekhristo
We have been implementing changes in the way we handle the submission to the market and we do the reviews. It could happen that we miss your product, we made mistakes, we try to fix them. At this moment there's no file associate with your plugin, please re-upload it. (if you uploaded the plugin with a previous user, then there's only one file uploaded and not a second one).
both
All markets have similar apps/themes/plugins/products, take a look at envato, google play, itunes,... we do not allow piracy and we do not allow copies, if the same solution is reached by two different codes, then both could be published. Following your reasoning we should only allow one and only one payments plugin for example, or only one plugin to share your listing on social media. Well, one plugin may do something different, another could be more configurable,... those are different options for the users.
If anyone has doubts or proof that one plugin/theme is copy of another, please contact us. We'll review them.