well rocketman I thought I was enough of a greasy fly for you
I tend to think most vendors cling to their nic supplier with a vengeance. I have been told as much by two suppliers, and have an interesting email from someone abroad that would seem to imply the same.
With how 'secretive' our vendors are wrt to their sources, it certainly makes sense. They've found something they approve of, they want to keep it coming, and don't want anyone else to find out about it. Perhaps if they caught wind of something better they may jump ship, or if they had difficulty obtaining their 'favorite' nic. But otherwise.
And from what I hear about the nic situation 'over there' there are dozens of places to get it, and only a tiny handful with a decent product. So assuming this is true, again, cling with a vengeance.
But yes, batch to batch variation, PG/VG variation, bottling variation, some guy who didn't wash his hands when cutting the nic...variation lol
And what casey, r77 et al. said
EDIT: If anyone wants to see something pretty funny, that wouldn't be appropriate to post here, please pm me your email addy if I don't already have it. I can promise you'll crack up.
pm ing now..........