From time to time, we use Amazon Associates links in our blog, help pages, or newsletter to direct readers to certain products that we recommend, like headsets and PCs, which we think will help people use our software more effectively. Some of these links earn us a referral fee on purchases ultimately made via the link. We aren't doing this to earn advertising revenue (though it's a nice perk) - we use the links to help us gather better data on hardware purchases made by our users. We think that understanding these trends will help us cater better to our users' needs when it comes to hardware support and enable us to forge better long-term partnerships with the companies that make headsets and computers capable of running VR.
Or, in legal terms: IrisVR, Inc. is a participant In the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.