It tosses in the incentive to start recommending things based on how valuable the affiliate link would be,diluting the value of the recommendations
If I decide to buy the same equipment, I see nothing wrong using their affiliate links.
Reference: https://news.ycombinator.com/item?id=17793341.
OT: I checked your profile but couldn't find an email to contact you. It'd be cool if I can ping once a while to get feedback on where the project is heading.