.................. Im almost 100% sure that WT, in some of their liquids use sugar and that that made caramel in my atty (i have no idea if its true but it just seems like a good explanation to me )
Did you mean TW? .. if that's the case then I can assure you the the DV (Decadent Vapour) range do not contain any sugars or oils, they are made specifically for vaping, The Titan and Red Label eliquids are made by manufacturers of ENI's and know that sugar and oil based ingredients are not suitable.
I actually believe the warranty is too generous myself, as a heavy vaper, I have never expected ANY atomiser to be performing as new after 14 days, and it's a question of expense over convenience, standard 510's are cheap, but less convenient, while Tank Atomiser are more convenient, they are prone to suffer if excessively vaped on, and in the end all atomisers are regarded as disposable, the fact that members have found various ways to extend the lives of atomisers, there is none other than blowing through that don't invalidate the warranty.
If you can get yourself organised, you could cut vaping costs by mixing your own liquids and in the end do what I do and budget for a new atomiser every week or fortnight, for me personally it is a fraction of the cost compared to smoking tobacco.