If you spend £500 on a marker, it's worth more like £350 the moment you open the box. It'll then need breaking in and fine tuning...
But, wait a year until a newer model comes out, and you can suddenly buy the marker that was £500 new for £200... and it's settled down and had any issues ironed out. No-brainer IMHO!
For example, I recently bought myself a Dye NT10. When it was new in 2010 (only 4 years ago) it was a top of the range marker, used by a fair number of top pro teams.,. it also cost the thick end of a grand. It's light, fast, reliable if maintained properly, and will stand up against any marker out there. As it's 4 years old and a bit tatty, I paid £140!