zero, I dont know if you are right on this but if you are, I do have some questions:
1. copper tarnish a lot and it gets green
2. We will earn 0,05 volts, that is really nothing
3. Copper tarnish inside tube too so cleaning becomes much harder
I am wondering where vaping is going sometimes. But I do think that we are in experimental times, so people still try to find the best. To my opinion we search for nothing. We already have the best.
What we all really need is a mod that is very user friendly, thin, made in a clever way, with very good conductivity, no gaps and beautiful too (if we are talking about mechanical mods) and something that will solve serious problems on vaping (if we are talking about electronic mods).