Shareware, free version not useful

The plugin is too limited to be offered in WP repository. Free version has only 3 sale options: $10 off, 10% off, BOGO and that’s it, if you want to offer 5% or 15% discount you have to buy paid version. In my opinion such shareware versions should not be placed in WP plugin repository.
Also the plugin creates its own upper-level entry in WP dashboard which is a really bad practice.