Do most vapers who are staying with one style of PV find it more cost effective to buy extra batteries and attys separately or just buy more "starter kits" which usually have 2 batteries and 2 attys and toss aside the extra chargers. It seems like it is a better deal to keep buying starter kits instead of $10 per battery and $8 for each atty. Kind of like buying a brand new printer each time your ink runs out-often buying a new printer with full ink cartridge is cheaper than buying just the ink and then you can donate the printers.