A case could be made, but I think it would be an injustice to the community. While most smokers are addicted to nicotine, there is a smaller percentage who are just as, if not more addicted to the other alkaloids in tobacco. There are no studies on this, only people's experiences to back this up.
In my case, I started vaping with 12 mg. 18 mg was too strong for me and for many people this is also the case. This is partly due to equipment used, and partly due to one's vape style. If a person inhales vape like a cigarette, they will absorb much less nicotine than a person who inhales vape like a pipe or cigar. It's commonly known that the lungs are terrible at absorbing nicotine through vapor, and most nic absorption comes from the mucus membranes of the mouth and sinuses.
As for people encouraging or discouraging high nic vapors, that answer is easy enough. More and more vendors are only selling liquid with a 32 mg. cap. It's the rare vendor who carries 36 or higher. Even just a few years ago 36 mg. was considered the "high nic" by vendors, now it's usually the 18 mg. or 24 mg. that is the "high nic."
WTA's occur at a ratio of 5% to nicotine's 95% in tobacco. I believe that Jerry has tried to maintain this ratio in his product. Ethan's low, normal, high and extra high WTA ratios baffle me. At what point do we cross a line and say that "X" percentage of WTA is normal for a WTA e-juice and any higher is a "tobacco additive?" Should we as vapers be unconcerned or concerned about 10% or 15% (or even higher) WTA juices?
Where are you getting 10, 15, or higher? Maybe more than "feels non-existent" is just the right amount.