i think you have an interesting point but maybe the wrong idea
here are the current csgo ranks:
http://imgur.com/ZczF4ii
~rank 3900 in csgo will get you experienced with 3000 points
the next rank is 500 for exceptional here:
http://imgur.com/qWBEYuM
these ranks have been around a very long time
i think for csgo, maybe adjusting the points for ranks below exceptional would make more sense
let's look at css ranks here:
http://imgur.com/DZq4UJY
the next rank is 500 for exceptional here:
http://imgur.com/8Neebds
so for csgo you have to go from 3000 points to ~20000 points
for css you have to go from 6000 points to ~21000 points
there are over twice as many surfers that are ranked in csgo than css and it is much easier to get improvement points on low tier maps
for example, i have ~6600 improvement points on 168 maps for css
i have ~6400 improvement points on 17 (!!!) maps in csgo
so at a minimum copying css ranks below exceptional would be a good first step and i would even double that in scale for csgo
12000+ Experienced
8000-11999 Skilled
5000-7999 Casual
2000-4999 Beginner
0-1999 Rookie
i'm sure evolv/untouch have their reasons though and it would anger everyone 12000 points and below
i can only speak for css, but the difference in skill between rank 500 and 300 is huge
the difference in skill between 300 and 100 is even more crazy
the top 100 surfers on css are in a different tier altogether