I cannot speak for Cool_Breeze, but I do know that many people(and eliquid-makers), myself included, add water for the reasons of improved wicking, improved evaporation and "more opened" taste, even with unflavored... A 50/50 mix for me, would be 45/45/10, not counting the nic, and that is still 50/50 pg/vg ratio 
10% water with my PG liquids. 20% water my with 100% VG liquids.
I will use 70%PG/30%VG (otherwise it is hard for me to breathe), 16.5mg nicotine (what was easiest to make doing 3ml testers).
If they are not I will be very very. 
