[Royal]

Yes, I heard something about that. No Thanks, I'll pass.

You are mistaken about 5 volts not getting any gunk build up. I get just as much build up at 5 volts as I do with 3.7.

However I can say that I get less of a build up with my DIY mix as I do with any store boughts, at any voltage. I do not like a sweet or strong flavor, so my DIY does not contain as many sugars as most.

The only other observation I can state is, I can take a gunked up atty, that won't produce at 3.7 volts, and still get some production out of it on 5 volts, still it is markedly less than a clean atty.
If someone is taking really long hits, and is not keeping their atty wet, then this will cause some super heating with any voltage. Some stock e-cig batteries have this type of feature built in. Which goes in to a heating/cleaning mode after so many activations.
This cycle lasts about 10 seconds. So it stands to reason you could get this same self cleaning effect on higher voltage in less time, which is something I already touched on. However my draws are relatively short in comparison with what I have to take from 3.7 volts.

I have a drawer full of gunked up attys that were used at 5 volts. One of these days, I will get around to cleaning them. I am just lazy in that respect and find it easier to just pop a new one on. Still it is very cost effective when considering the expense of a new atty vs. analogs.