My beige Microsoft mouse I bought in 2003 and it still works 100%. Only reason I bought it then was because there was 1 scene in Medal of Honour Allied Assault that I just couldn't get through as it was too hectic for my mouse with a ball to handle. I had to go high tech and get a balless mouse, wow what a difference it made, and I am still gaming on it today
Thats a 400dpi mouse...
I still have my 800dpi original Logitech MX 500 and it doesn't do so well at 1080p. I can't imagine using a 400dpi mouse.
As for spending R1500 on a mouse... I have a G502 hero which is great for gaming, but the scroll wheel and the horizontal scroll is just OK. Since my wife appropriated my original Logitech MX Master, I bought an MX Master 3. Best. Work. Mouse. Ever.
Yes, it is worth it having and using 2 x R1000+ mice.
Seriously, those that have some spare cash, are curious and sit in front of a PC for 8 hours a day. Spend the money, buy an MX Master 3 and see for yourself.
Edit: As for my gaming mouse recommendation. Razer Deathadder was good, the scroll wheel is just not that accurate and feels funny.
I had a Logitech G403, and the scroll wheel broke. It would first go in the wrong direction, before going in the right direction.
G502 is great, but I think I preferred the feel of the 403.
The layout of the 502's buttons is better, though, and I sometimes use the DPI switching in games. Especially at higher resolutions the ideal fps mouse sensitivity and ideal menu sensitivity is very different, so I have to switch in menus.