This applies to any plugin review you leave here on wordpress.org:
Ratings should reflect your experience with the plugin you are downloading from wordpress.org specifically, as well as support received. The ratings should not reflect premium add-ons available or what you think of their pricing. In the light of that this 1 star rating is unfair and I hope you understand that. Think about why the review system actually exists. You leave a review to help other people know about your experience with the plugin, and give valuable feedback to the developer. I don't think your review achieves any of those two aims.
With regards to add-on pricing, plugin developers make their hard-work available for free via plugins in the repository, and then may supply premium add-ons to further support development of the plugin. Whether you think the price is cheap or not should have no reflection in the ratings you give here.
We have introduced premium add-on bundles. You can now have the Simple Feeds Bundle for $35 or the Advanced Feeds Bundle for $77. Therefore your calculation is not correct.