It used to be when you bought a laser printer that the "starter" size would last about 3500 pages. Now that is considered a "regular" size and the "starter" size is about 1500 pages. I bought a Konica/Minolta laser printer about 10 years ago and you could get a toner cartridge that was rated for 12,000 pages.
Now they count the pages and start throwing up error messages when you reach the number of pages that the cartridge is rated for. The Brother printer we have would still print, but you had to clear a couple of error messages before every page. Still lots of toner, but basically unusable. There are some tricks to get around the page count on most printers if you seek them out. We were able to find out how to reset the page count and now we don't get the error messages and the print quality if still very good. This is on a B&W printer, not a color.
The high cost of HP toner is the main reason I don't buy HP printers.