You know higher DPI = not better tracking? :P
DPI is 100% marketing, nothing else.
Very few people use over 3000dpi. and if they do, its cause they dont know better and have in-game sens turned very low.
95% of pro fps players use between 300 - 1000dpi. Lower dpi will help your accuracy & muscle memory.
I used to be a "high" dpi'er myself, till I started playing CS:GO.
Now I use 350Dpi and 800 for desktop.