Discounts other than the yearly plan discount are not available.
Yes, post reactions are provided for the Facebook pages for which you have admin access. Gatekeepr provides number of fans, comments, shares from other Facebook pages (such as competitors) but does not provide reactions for Facebook pages you don't own. Unlike most social monitoring softwares, Gatekeepr only gives access to the data provided by Facebook API. In other words, Gatekeepr does not scrap Facebook or any other social media to get some extra data. Gatekeepr does not provide private data in any way and stick to GDPR (General Data Protection Regulation) compliance.
No, it does not. The number of Facebook pages is the total of Facebook pages included in your entire plan.