So in a thread over on the other big forum, I appears the BRS has changed their description of the roller head replacement from 2000 hours to 9000 hours. Once a year replacement seems much more reasonable!
https://www.bulkreefsupply.com/repla...tp-kamoer.html
“Replacement 6-roller head assembly for the Kamoer FX-STP Dosing Pump. Over time it is common for the rollers to start to wear and cause additional friction, which can slow the pumps motor and require additional electricity to operate. We recommend changing the pump head assembly every 9000 hours, or as needed.”