Because WTA juices undergo some extreme chemical processes to extract the WTA's, it is important to realize that for health conscious vapers,
GC-MS testing is
especially critical in your product more so than typical e-juice that is simply flavoring/PG/VG/nicotine - people who have any scientific background would naturally have a concern about residuals.
Therefore, it would be well worth the investment to get an independent GC-MS analysis done and post it on the website, an analogy would be that, these days, not so many people will buy a car without seeing the CARFAX or similar first. People have become wary of everything these days, and the scaredy-cats are a huge segment of the market! Just sayin!
PS - the decision to go 100% VG as the default carrier for your unflavored WTA juice was a shrewd one, I have a theory that this is a big reason Boba's is so popular, because it is most vaper's first encounter with 100% VG and they love it!