WTF is it with sellers and feedback etiquette

Just a rant.. I’ve had a pretty good sales run lately, several items have been sold to people that are also eBay sellers.. not one have left feedback.. wtf.. I’ve been a seller since 2012, 100% feedbacks, only 1 negative in the entire run, and it was for a minor issue that I refunded complete.. not a business, solely a side gig, but I take pride in what I do, whatever it is.. and I leave feedback for all of my buyers, if there are negatives to offer, I offer privately unless it is an obvious egregious issue .. Back to the point, as a seller, why would you not provide the courtesy of feedback to your fellow seller?!?! ASSHOLES….

thanks for listening, have a great day